- American College of Construction Lawyers, Founder, Board Member 1989-1995, Treasurer 1996-2000; President 2001-2002
- Council and Budget Officer, ABA Section of Public Contract Law, 1990-1995
- Chairman, ABA Section of Public Contract Law, Construction Committee, 1987-1990
- Chairman, ABA Region III, 1983-1987
- Chairman, Section of Government Contracts and Litigation, D.C. Bar, 1982-1986
- Chairman, Subcommittee on D.C. Procurement, D.C. Bar Section of Government Contracts and Litigation, 1987-1989
- Member, Federal Bar Association
- Assistant General Counsel for NASA Support, U.S. Army Corps of Engineers, Office of General Counsel, 1968-1970
- Attorney/Advisor, NASA, 1966-1968
ABA Forum Committee on the Construction Industry, ABA Section of Public Contract Law, American Arbitration Association Panel of Arbitrators, American Arbitration Association’s Large Complex Case Panel, State Bar of Texas Construction Law Section