UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13D-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13D-2(a) (AMENDMENT NO. )* Michael Baker Corporation -------------------------------------------------------------------------------- (Name of issuer) Common Stock, par value $1.00 per share -------------------------------------------------------------------------------- (Title of class of securities) 057149106 -------------------------------------------------------------------------------- (CUSIP number) COPY TO: Matthew J. Day, Esq. 118 E. 25th Street, Eighth Floor New York, New York 10010 (212) 673-0484 -------------------------------------------------------------------------------- (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) May 14, 2003 -------------------------------------------------------------------------------- (Dates of Events which Require Filing of this Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box. [ ] Note. Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent. (Continued on following pages) (Page 1 of 22 Pages) --------------- *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). ------------------- ------------ CUSIP NO. 057149106 Page 2 of 22 ------------------- ------------ SCHEDULE 13D -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Acquisitor Holdings (Bermuda) Ltd. No IRS Identification Number -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [x] -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) [ ] -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Bermuda -------------------------------------------------------------------------------- 7. SOLE VOTING POWER NUMBER OF 410,800 SHARES ------------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER OWNED BY 0 EACH ------------------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON 410,800 WITH ------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 410,800 -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.0% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON * CO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! ------------------- ------------ CUSIP NO. 057149106 Page 3 of 22 ------------------- ------------ SCHEDULE 13D -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) J O Hambro Capital Management Group Limited No IRS Identification Number -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [x] -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS AF -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) [ ] -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION England -------------------------------------------------------------------------------- 7. SOLE VOTING POWER NUMBER OF 0 SHARES ------------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER OWNED BY 61,900 EACH ------------------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON 0 WITH ------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 61,900 -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 61,900 -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.8% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON * HC -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! ------------------- ------------ CUSIP NO. 057149106 Page 4 of 22 ------------------- ------------ SCHEDULE 13D -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) J O Hambro Capital Management Limited No IRS Identification Number -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [x] -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS AF -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) [ ] -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION England -------------------------------------------------------------------------------- 7. SOLE VOTING POWER NUMBER OF 0 SHARES ------------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER OWNED BY 61,900 EACH ------------------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON 0 WITH ------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 61,900 -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 61,900 -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.8% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON * IA -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! ------------------- ------------ CUSIP NO. 057149106 Page 5 of 22 ------------------- ------------ SCHEDULE 13D -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Christopher Harwood Bernard Mills No IRS Identification Number -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [x] -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS AF -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) [ ] -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION England -------------------------------------------------------------------------------- 7. SOLE VOTING POWER NUMBER OF 0 SHARES ------------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER OWNED BY 472,700 EACH ------------------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON 0 WITH ------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 472,700 -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 472,700 -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.7% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON * IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! ------------------- ------------ CUSIP NO. 057149106 Page 6 of 22 ------------------- ------------ SCHEDULE 13D -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) American Opportunity Trust plc No IRS Identification Number -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [x] -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) [ ] -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION England -------------------------------------------------------------------------------- 7. SOLE VOTING POWER NUMBER OF 0 SHARES ------------------------------------------------------------- BENEFICIALLY 8. SHARED VOTING POWER OWNED BY 61,900 EACH ------------------------------------------------------------- REPORTING 9. SOLE DISPOSITIVE POWER PERSON 0 WITH ------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 61,900 -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 61,900 -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.8% -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON * IV -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! STATEMENT ON SCHEDULE 13D ------------------------- This Statement on Schedule 13D (the "Statement") is filed on behalf of the Filing Parties (defined below). ITEM 1. SECURITY AND ISSUER. The class of equity securities to which this Statement relates is the common stock, par value $1.00 per share (the "Common Stock"), of Michael Baker Corporation, a Pennsylvania corporation (the "Issuer"). The principal executive offices of the Issuer are located at Airside Business Park, 100 Airside Drive, Moon Township, Pennsylvania 15108. ITEM 2. IDENTITY AND BACKGROUND. 2 (a-c,f). I. FILING PARTIES: -------------- This Statement is filed on behalf of the following five persons, who are collectively referred to as the "Filing Parties": 1. Acquisitor Holdings (Bermuda) Ltd., a company incorporated in Bermuda ("Acquisitor"), with a business address of Clarendon House, 2 Church Street, Hamilton HM 11, Bermuda. Acquisitor was formed in 2002 and endeavors to achieve a high rate of capital growth for its shareholders by acquiring significant holdings in companies which the members of its Board of Directors consider to be fundamentally sound but which are valued at a discount to the Directors' estimate of their private market value. Acquisitor is managed by its Board of Directors. 2. J O Hambro Capital Management Group Limited ("J O Hambro Group") is a corporation organized under the laws of England with its principal office and business at Ryder Court, 14 Ryder Street, London SW1Y 6QB England. J O Hambro Group functions as the ultimate holding company for J O Hambro Capital Management Limited. 3. J O Hambro Capital Management Limited ("J O Hambro Capital Management") is a corporation organized under the laws of England with its principal office and business at Ryder Court, 14 Ryder Street, London SW1Y 6QB England. J O Hambro Capital Management is principally engaged in the business of investment management and advising. It serves as co-investment adviser to North Atlantic Smaller Companies Investment Trust plc ("NASCIT") and American Opportunity Trust plc ("American Opportunity Trust") and as investment adviser to Oryx International Growth Fund Limited ("Oryx"), The Trident North Atlantic Fund ("Trident North Atlantic") and The Trident European Fund ("Trident European"), as well as to private clients. 4. Christopher Harwood Bernard Mills is a British citizen whose business address is Ryder Court, 14 Ryder Street, London SW1Y 6QB England. His principal employment includes service as executive director of NASCIT and American Opportunity Trust, as a director of J O Hambro Group, J O Hambro Capital Management, Trident North Atlantic, Oryx, Acquisitor plc and Acquisitor, and as co-investment adviser to NASCIT and American Opportunity Trust. 5. American Opportunity Trust is a corporation organized under the laws of England with its principal office and business at Ryder Court, 14 Ryder Street, London SW1Y 6QB England. American Opportunity Trust is a publicly-held investment trust company. Christopher Harwood Bernard Mills and J O Hambro Capital Management serve as co-investment advisers to American Opportunity Trust. Page 7 of 22 II. CONTROL RELATIONSHIPS: --------------------- J O Hambro Capital Management is a wholly-owned subsidiary of J O Hambro Group. Christopher Harwood Bernard Mills serves as a director of J O Hambro Group, J O Hambro Capital Management, and Acquisitor, and as executive director of American Opportunity Trust. III. EXECUTIVE OFFICERS AND DIRECTORS: -------------------------------- In accordance with the provisions of General Instruction C to Schedule 13D, information concerning the executive officers and directors of the Filing Parties is included in Schedule A hereto and is incorporated by reference herein. (d) Criminal Proceedings --------------------- During the last five years, neither the Filing Parties (or a controlling entity thereof) nor any executive officer or director of any of the Filing Parties (or a controlling entity thereof) has been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors). (e) Civil Securities Law Proceedings ----------------------------------- During the last five years, neither the Filing Parties (or a controlling entity thereof) nor any executive officer or director of any of the Filing Parties (or a controlling entity thereof) has been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION. The aggregate purchase price of the 410,800 shares of Common Stock beneficially held by Acquisitor is $4,132,277. All of the shares of Common Stock beneficially owned by Acquisitor were paid for using its working capital funds. The aggregate purchase price of the 61,900 shares of Common Stock beneficially held by American Opportunity Trust is $537,199 (exclusive of brokerage fees and commissions). All of the shares of Common Stock beneficially held by American Opportunity Trust were paid for using its working capital funds. ITEM 4. PURPOSE OF TRANSACTION. The Filing Parties believe that the shares of Common Stock of the Issuer are undervalued and represent an attractive investment opportunity. They presently have no plans or proposals which would relate to or result in any of the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D except as set forth herein. The Filing Parties intend to have open communications with the Issuer's management in order to monitor their efforts to increase stockholder value. Depending on various factors including, without limitation, the Issuer's financial position and investment strategy, the price levels of the shares of Common Stock, conditions in the securities markets and general economic and industry conditions, the Filing Parties may in the future take such actions with respect to their investment in the Issuer as they deem appropriate, including without limitation purchasing additional shares of Common Stock in the open market or otherwise, making an offer to purchase up to all of the Issuer's outstanding shares of Common Stock through a negotiated transaction or otherwise, seeking to elect a slate of directors to the Issuer's board of directors or presenting proposals for stockholders' consideration at an annual or special meeting of the Issuer's stockholders. The Filing Parties may also sell some or all of their shares of Common Stock in the open market or through privately negotiated transactions, or change their intention with respect to any and all matters referred to in this Item 4. Page 8 of 22 ITEM 5. INTEREST IN SECURITIES OF THE ISSUER. (a)-(b) The aggregate number and percentage of the outstanding Common Stock of the Issuer beneficially owned (i) by each of the Filing Parties, and (ii) to the knowledge of the Filing Parties, by each other person who may be deemed to be a member of the group, is as follows: Number of Number of Shares: Sole Shares: Shared Aggregate Number Power to Vote or Power to Vote or Approximate Filing Party of Shares Dispose Dispose Percentage* ---------------------------------------------------------------------------------------------- Acquisitor 410,800 410,800 0 4.95% J O Hambro Group 61,900 0 61,900 0.75% J O Hambro Capital 61,900 0 61,900 0.75% Management Christopher H. B. Mills 472,700 0 472,700 5.69% American Opportunity Trust 61,900 0 61,900 0.75% ---------------------------------------------------------------------------------------------- * Based on 8,303,123 shares of Common Stock, par value $1.00 per share, outstanding as of March 17, 2003, which is based on information reported in the Issuer's Annual Report on Form 10-K, for the year ended December 31, 2002. Page 9 of 22 (c) During the past 60 days, the Filing Parties effected no transactions in the Common Stock other than those set forth in the following table: --------- ---------------------------------- ----------- ---------------- ------ Date Filing Party Buy or Sell Number of Shares Price --------- ---------------------------------- ----------- ---------------- ------ --------- ---------------------------------- ----------- ---------------- ------ 4/2/2003 Acquisitor Holdings (Bermuda) Ltd. Buy 7,200 $ 8.43 --------- ---------------------------------- ----------- ---------------- ------ 5/14/2003 Acquisitor Holdings (Bermuda) Ltd. Buy 168,900 $ 8.55 --------- ---------------------------------- ----------- ---------------- ------ All of the above transactions were effected on the open market. (d) No person other than the Filing Parties is known to have the right to receive, or the power to direct the receipt of dividends from, or the proceeds from the sale of, such shares of Common Stock. ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER. As co-investment advisers to American Opportunity Trust, Christopher Harwood Bernard Mills and J O Hambro Capital Management share the right to transfer and vote the shares of the Common Stock of the Issuer pursuant to an agreement dated as of January 7, 1993 between American Opportunity Trust and J O Hambro Capital Management. On May 27, 2003, the Filing Parties entered into the Joint Filing Agreement, which is attached hereto as an exhibit and incorporated herein by reference. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS. The following documents are filed herewith or incorporated by reference herein: (a) Administration, Management and Custody Management Agreement dated as of January 7, 1993 between J O Hambro Capital Management and American Opportunity Trust. (b) Joint Filing Agreement dated as of May 27, 2003 by and among Acquisitor Holdings (Bermuda) Ltd., J O Hambro Capital Management Group Limited, J O Hambro Capital Management Limited, American Opportunity Trust Plc and Christopher H. B. Mills. Page 10 of 22 SIGNATURE After reasonable inquiry and to the best of our knowledge and belief, we certify that the information set forth in this statement is true, complete and correct. Dated: May 27, 2003 ACQUISITOR HOLDINGS (BERMUDA) LTD. J O HAMBRO CAPITAL MANAGEMENT GROUP LIMITED By: /s/ Duncan Soukup By: /s/ R. G. Barrett --------------------------- --------------------------- Name: Duncan Soukup Name: R. G. Barrett Title: Deputy Chairman Title: Director J O HAMBRO CAPITAL MANAGEMENT LIMITED AMERICAN OPPORTUNITY TRUST PLC By: J O Hambro Capital Management Limited, Its investment advisor By: /s/ R. G. Barrett By: /s/ R. G. Barrett --------------------------- --------------------------- Name: R. G. Barrett Name: R. G. Barrett Title: Director Title: Director /s/ Christopher Mills --------------------------- CHRISTOPHER MILLS Page 11 of 22 SCHEDULE A Information Concerning Directors and Executive Officers of the Filing Parties The following table sets forth certain information concerning each of the directors and executive officers of Acquisitor Holdings (Bermuda) Ltd. ("Acquisitor") as of the date hereof. Name: Duncan Soukup (Deputy Chairman) Citizenship: British Business Address: 118 E. 25th Street, 8th Floor New York, New York 10010 USA Principal Occupation: Deputy Chairman, Acquisitor Managing Director, Acquisitor plc President and Chief Executive Officer, Lionheart Group, Inc. Managing Director, New York Holdings Ltd. Name: Luke Oliver Johnson (Director) Citizenship: British Business Address: Clarendon House 2 Church Street Hamilton HM 11 Bermuda Principal Occupation: Director, Acquisitor Director, Acquisitor plc Chairman, Signature Restaurants plc Name: John Stanislas Albert Radziwill (Chairman) Citizenship: British Business Address: Clarendon House 2 Church Street Hamilton HM 11 Bermuda Principal Occupation: Chairman, Acquisitor Chairman, Acquisitor plc Chairman and Chief Executive Officer, New York Holdings Ltd. Director, Goldcrown Group Limited Director, International Assets Holding Corporation Name: James Ozanne (Non-Executive Director) Citizenship: USA Business Address: Clarendon House 2 Church Street Hamilton HM 11 Bermuda Principal Occupation: Non-Executive Director, Acquisitor Principal, Greenrange Partners Director, Financial Security Assurance Page 12 of 22 Name: Christopher Harwood Bernard Mills (Non-Executive Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Non-Executive Director, Acquisitor Non-Executive Director, Acquisitor plc Executive Director, NASCIT Executive Director, American Opportunity Trust Director, J O Hambro Capital Management Name: Peter Melhado (Non-Executive Director) Citizenship: USA Business Address: Clarendon House 2 Church Street Hamilton HM 11 Bermuda Principal Occupation: Non-Executive Director, Acquisitor General Partner, Polaris Partners, L.P. Name: Timothy James Carey Lovell (Non-Executive Director and Assistant Secretary) Citizenship: British Business Address: 9 Walton Street 1st Floor London England SW3 2JD Principal Occupation: Finance Director, Acquisitor plc Page 13 of 22 The following table sets forth certain information concerning each of the directors and executive officers of J O Hambro Capital Management Group Limited ("J O Hambro Group") as of the date hereof. Name: James Daryl Hambro (Chairman) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Chairman, J O Hambro Capital Management Name: Christopher Harwood Bernard Mills (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Non-Executive Director, Acquisitor Non-Executive Director, Acquisitor plc Executive Director, NASCIT Executive Director, American Opportunity Trust Director, J O Hambro Capital Management Name: Nichola Pease (Director and Chief Executive) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director and Chief Executive, J O Hambro Capital Management Name: Basil Postan (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director, J O Hambro Capital Management Page 14 of 22 Name: Graham Warner (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director, J O Hambro Capital Management Name: Robert George Barrett (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director, J O Hambro Capital Management Name: Nicholas James Measham (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director, J O Hambro Capital Management Name: Willem Vinke (Director) Citizenship: Dutch Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director, J O Hambro Capital Management Page 15 of 22 The following table sets forth certain information concerning each of the directors and executive officers of J O Hambro Capital Management Limited ("J O Hambro Capital Management") as of the date hereof. Name: James Daryl Hambro (Managing Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Managing Director, J O Hambro Capital Management Name: Christopher Harwood Bernard Mills (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Non-Executive Director, Acquisitor Non-Executive Director, Acquisitor plc Executive Director, NASCIT Executive Director, American Opportunity Trust Director, J O Hambro Capital Management Name: Nichola Pease (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director and Chief Executive, J O Hambro Capital Management Page 16 of 22 Name: Basil Postan (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director, J O Hambro Capital Management Name: Robert George Barrett (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director, J O Hambro Capital Management Name: Nicholas James Measham (Director) Citizenship: British Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director, J O Hambro Capital Management Name: Willem Vinke (Director) Citizenship: Dutch Business Address: J O Hambro Capital Management Limited Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Director, J O Hambro Capital Management Page 17 of 22 The following table sets forth certain information concerning each of the directors and executive officers of American Opportunity Trust plc ("American Opportunity Trust") as of the date hereof. Name: R. Alexander Hammond-Chambers (Chairman) Citizenship: British Business Address: 29 Rutland Square Edinburgh EH1 2BW Scotland Principal Occupation: Non-Executive Director, American Opportunity Trust Name: Christopher Harwood Bernard Mills (Executive Director) Citizenship: British Business Address: Ryder Court 14 Ryder Street London SW1Y 6QB England Principal Occupation: Non-Executive Director, Acquisitor Non-Executive Director, Acquisitor plc Executive Director, American Opportunity Trust Executive Director, NASCIT Director, J O Hambro Capital Management Name: John Gildea (Director) Citizenship: USA Business Address: Gildea Management Company(1) 537 Steamboat Road Greenwich, Connecticut 06830 Principal Occupation: Managing Director, Gildea Management Company Name: The Hon. James J. Nelson (Director) Citizenship: British Business Address: Foreign & Colonial Ventures(2) 4th Floor Berkeley Square House Berkeley Square London W1X 5PA England Principal Occupation: Director, Foreign & Colonial Ventures --------------- (1) Gildea Management Company is principally engaged in the investment management business. (2) Foreign & Colonial Ventures is principally engaged in the investment management business. Page 18 of 22 Name: Iain Tulloch (Director) Citizenship: British Business Address: Murray Johnstone Ltd.(3) 7 West Nile Street Glasgow G2 2PX Scotland Principal Occupation: Director, Murray Johnstone Ltd. Name: Philip Ehrman (Director) Citizenship: British Business Address: Gartmore Investment Management Ltd.(4) Gartmore House 16-18 Monument Street London EC3R 8AJ England Principal Occupation: Investment Manager, Gartmore Investment Management Ltd.--------------- (3) Murray Johnstone Ltd. is principally engaged in the investment management business. (4) Gartmore Investment Management Limited is principally engaged in the investment management business. Page 19 of 22 Exhibit Index The following documents are filed herewith or incorporated herein by reference: Exhibit Page (a) Administration, Management and Custody Management Incorporated by reference to Exhibit Agreement dated as of January 7, 1993 between J O Hambro (a) of the Schedule 13D Amendment Capital Management and American Opportunity Trust. No. 1 filed on February 20, 2001 by Acquisitor plc and the other parties thereto with respect to Colorado MEDtech Inc. (b) Joint Filing Agreement dated as of May 27, 2003 22 among Acquisitor Holdings (Bermuda) Ltd., J O Hambro Capital Management Group Limited, J O Hambro Capital Management Limited, American Opportunity Trust and Christopher H. B. Mills. Page 20 of 22 JOINT FILING AGREEMENT By and Among ACQUISITOR HOLDINGS (BERMUDA) LTD. J O HAMBRO CAPITAL MANAGEMENT GROUP LIMITED J O HAMBRO CAPITAL MANAGEMENT LIMITED AMERICAN OPPORTUNITY TRUST PLC and CHRISTOPHER H. B. MILLS As of May 27, 2003 Page 21 of 22 JOINT FILING AGREEMENT The undersigned hereby agree that the Statement on Schedule 13D dated May 27, 2003 ("Statement") with respect to the shares of common stock, $1.00 par value, of Michael Baker Corporation is hereby filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended. The undersigned hereby agree that any amendments to the Statement executed by each or any of us shall be filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in separate counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same instrument. Date: May 27, 2003 ACQUISITOR HOLDINGS (BERMUDA) LTD. J O HAMBRO CAPITAL MANAGEMENT GROUP LIMITED By: /s/ Duncan Soukup By: /s/ R. G. Barrett --------------------------- --------------------------- Name: Duncan Soukup Name: R. G. Barrett Title: Deputy Chairman Title: Director J O HAMBRO CAPITAL MANAGEMENT LIMITED AMERICAN OPPORTUNITY TRUST PLC By: J O Hambro Capital Management Limited, Its investment advisor By: /s/ R. G. Barrett By: /s/ R. G. Barrett --------------------------- --------------------------- Name: R. G. Barrett Name: R. G. Barrett Title: Director Title: Director /s/ Christopher Mills --------------------------- CHRISTOPHER MILLS Page 22 of 22