1 EXHIBIT 21.1 SUBSIDIARIES OF THE REGISTRANT The following entities, unless otherwise indicated, are wholly-owned direct or indirect subsidiaries of the Registrant as of December 31, 2000: State or Country Name of Organization ---- --------------- 1. Baker Environmental, Inc. Pennsylvania 2. Baker Heavy & Highway, Inc. Pennsylvania 3. Baker Mellon Stuart Construction, Inc. Pennsylvania 4. Mellon Stuart Building Services, Inc. Pennsylvania 5. Mellon Stuart Construction International, Inc. Pennsylvania 6. Michael Baker Global, Inc. Pennsylvania 7. Michael Baker Jr., Inc. Pennsylvania 8. Michael Baker Alaska, Inc. Alaska 9. Baker Construction, Inc. Delaware 10. Baker Global Project Services, Inc. Delaware 11. Baker Holding Corporation Delaware 12. Baker/OTS, Inc. Delaware 13. International Pipeline Services, Inc. Delaware 14. Michael Baker International, Inc. Delaware 15. Baker GeoResearch, Inc. District of Columbia 16. Baker Engineering, Inc. Illinois 17. Steen Production Service, Inc. Louisiana 18. Michael Baker Jr. Company Nevada 19. Michael Baker Architects/Engineers, P.C. New Jersey 20. Baker Engineering NY, Inc. New York 21. Baker/MO Services, Inc. Texas 22. Vermont General Insurance Company Vermont 23. Michael Baker Barbados Ltd. Barbados 24. Baker O&M International, Ltd. Cayman Islands 25. Baker/OTS International, Inc. Cayman Islands 26. Overseas Technical Services (Middle East) Ltd. Cayman Islands 27. Michael Baker de Mexico S.A. de C.V. Mexico 28. OTS International Training Services Ltd. United Kingdom 29. Overseas Technical Services (Harrow) Ltd. United Kingdom 30. Baker/OTS Ltd. United Kingdom 31. SD Forty-Five Ltd. United Kingdom 32. Hanseatic Oilfield Services Ltd. Vanuatu 33. OTS Finance and Management Ltd. Vanuatu 34. Overseas Technical Service International Ltd. Vanuatu -1-