American College of Environmental Lawyers (Member since 2009); American Bar Association Section of Natural Resources, Energy and Environmental Law, Section Chair, 1989-1990, Chair Elect, 1988-1989, Section Vice Chairman, 1987-1988, Vice-Chair, Section Teleconference Committee, Council Member, 1984-1987, 1990-1991, Chairman, Air Quality Committee, 1982-1984 and Vice Chairman, 1980-1982. Vice Chair, Teleconference Committee, 1990—, American Bar Association Section on Business Law, Chair, Environment Controls Committee, 1990-1991. American Bar Association Representative on the National Conference of Lawyers and Scientists, 1990-1993. American Bar Association Science and Technology Section, Council Member, 1991-1992. American Bar Association Real Property, Probate and Trust Law Section, Vice Chair, Environmental Law Committee, 1990-1991. Member, Conference of Section Chairs Ad Hoc Committee on National Institutes, 1989. Chair, ABA's Standing Committee on National Conference Groups, 1993-1994. Chairman of the Virginia Bar Association's Environmental Committee, 1979-1980.