Exhibit 10a
INFORMATION ON MEMBERS OF THE SUPERVISORY BOARD, EXECUTIVE BOARD, STAFF DIRECTORS, AND OTHER MEMBERS OF THE SENIOR MANAGEMENT COMMITTEE
SUPERVISORY BOARD
Professor Luck M. van Leeuwen Ph.D. (1933), Chairman
Audit Committee, Selection and Remunera-tion Committee, Integrity Committee
Dutch nationality
Term 1991-2004
Current position: Professor at University of Brabant
Previous positions:
Chairman Executive Board Assurantieconcern Stad Rotterdam anno 1720 (1979-1994)
Member Netherlands Senate (1987-1999)
Non-executive board functions:
• Berenschot Holding N.V.
• Betonson Beheer N.V.
• International Advisory Board Fortis
• Colonnade N.V.
• Van Nieuwpoort Beheer N.V.
• Advisory Board Instituut voor Bedrijfskundigen (IBO)
• Arenthals Grant Thornton, Accountants and tax advisors
• Foundation Economic Cooperation Netherlands and Emerging Countries (SENO)
• Foundation Administration Office Shares Royal Volker Wessels Stevin N.V.
Carlos Espinosa de Los Monteros (1944)
Selection and Remuneration Committee
Spanish nationality
Term 1998-2006
Current position: Chairman and CEO Mercedes Benz España S.A. and DaimlerChrysler España Holding
Previous positions:
Chairman IBERIA Airlines (1983-1985)
Non-executive board functions:
• Acciona S.A.
• Inditex S.A. (Zara)
• Gonzalez Byass S.A.
André A. van der Louw (1933)
Integrity Committee
Dutch nationality
Term 1986-2004
Previous positions:
Chairman Dutch National Broad-casting Corporation
Member Dutch Parliament (1970-1971) and (1982-1983)
Minister of Culture, Recreation and Social Work (1981-1982)
Mayor City of Rotterdam (1974-1981)
Non-executive board functions:
• Stadion Feijenoord
1
Jan Peelen M.Sc. (1940)
Selection and Remuneration Committee
Dutch nationality
Term 2000-2004
Previous positions:
Member Executive Committee Unilever
Several management positions within Unilever or subsidiary companies thereof
Non-executive board functions:
• Albron BV
• Friesland Coberco Dairy Foods
• Buhrmann NV
• VVAA Group BV
• Wageningen University and Research Centre
• National Regie-Orgaan Genomics
Ross A. Webber Ph.D. (1934)
Audit Committee
U.S. nationality
Term 1993-2006
Current position: Emeritus Professor Wharton School of University of Pennsylvania.
Previous positions:
Vice President University of Pennsylvania (1981-1986)
Chairman Management Department Wharton School (1991-1995)
Non-executive Board functions:
• American Water Works Co., Inc.
• New Jersey-American Water Company
Rijnhard W.F. van Tets (1947)
Audit Committee
Dutch nationality
Term 2002-2006
Current position: Advisor to the Executive Board of ABN AMRO Bank (2002)
Previous positions:
Banque Europeenne de Credit (Brussels) and Societe Generale (Paris) (1973-1975)
Sogon Swiss and First Boston Corporation (New York: 1975-1983)
Member of the Executive Board of ABN AMRO Bank (1988-2002)
Non-executive Board functions:
• International Securities Market Association (Chairman)
• Foundation Holland Casino
• Reliant Energy Europe B.V.
• Wegener N.V. (Chairman)
• Foundation Company Pensionfund Building Industry (Chairman)
• Foundation Verenigd Bezit
• Foundation Kasteel de Haar
2
EXECUTIVE BOARD
Harrie L.J. Noy M.Eng. (1951), Chairman
Dutch nationality
Current position: Chairman Executive Board since 2000
Previous positions:
Worked for ARCADIS in various (management) positions throughout his career, most recently as Member Executive Board
Non-executive board functions:
• Civieltechnisch Centrum Uitvoering Research en Regelgeving (CUR)
• Foundation Habiforum
• Executive Board VNO-NCW
• Advisory Board Euronext
• Dutch-German Chamber of Commerce
Steven B. Blake M.Sc.Hydrology (1956)
U.S. nationality
Current position: Member Executive Board since 1999
Previous positions:
Before joining ARCADIS, held positions at Spill & Tank Management and Engineering Enterprises
Non-executive board functions:
• Construction Industry Roundtable
• U.S. National Water Well Association
• Federal Relations Committee – CIRT
C. Michiel Jaski M.Sc.Hydrology (1959)
Dutch nationality
Current position: Member Executive Board since 2000
Previous positions:
Before joining ARCADIS, held positions at Shell and Philips
Jan Zijlstra M.Eng. (1946)
Dutch nationality
Current position: Member Executive Board since 1999
Previous positions:
Worked for ARCADIS in various (management) positions throughout his career, most recently as managing director ARCADIS Bouw/Infra
Non-executive board functions:
• ONRI – Organization for Consulting and Engineering Firms
• Foundation Toekomstbeeld der Techniek
• Foundation P3&BI
• Railforum
• Foundation KNHM
STAFF DIRECTORS
Hans van Dord M.Eng. (1944)
Dutch nationality
Director Corporate Development since 2000
Henk W.M.W. ten Cate RA (1953)
Dutch nationality
Corporate Director Finance since 2001
3
Wim G.M. Rupert M.Sc. (1945)
Dutch nationality
Director Human Resources since 1994
Craig E. Eisen M.Sc. (1951)
U.S. nationality
Director Mergers and Acquisitions since 2002
MEMBERS OF THE SENIOR MANAGEMENT COMMITTEE
Joe A. Hastey (1948)
U.S. nationality
CEO ARCADIS G&M 1999
Yann Leblais M.Eng. (1952)
French nationality
CEO ARCADIS FCI 2000
Erhard Robold Dipl.-Ing. (1956)
German nationality
CEO ARCADIS Deutschland 1998
Antonio Rocha (1941)
Brazilian nationality
CEO ARCADIS Logos 1999
Rein J. Sirre M.Sc. (1942)
Dutch nationality
Managing Director ARCADIS Nederland 2000
Kees T. Slingerland M.Sc. (1960)
Dutch nationality
Managing Director ARCADIS Nederland 2000
Ludo Smans (1947)
Belgian nationality
Managing Director ARCADIS Belgium 1995
Luis Valenzuela M.Sc. (1943)
Chilean nationality
CEO ARCADIS Geotecnica 1989
Luis Villarroya M.Sc. (1953)
Spanish nationality
CEO Grupo EP 1999
Simon P. Warmerdam M.Sc. (1950)
Dutch nationality
Managing Director ARCADIS Euroconsult 2000
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