American Bar Association, Section of Environment, Energy and Resources-
Member of Council (1985-1988); CLE Committee Chairman (1988-1989); Chairman,
Water Quality Committee (1982-1985); Vice Chairman, Hard Minerals Committee
(1980-1982); Program Chair, Annual Environmental Law Conference, Keystone,
Colorado (1978-1994); Liaison, Rocky Mountain Mineral Law Foundation
(1995-2002).
Colorado Bar Association- Chairman, Mineral Law Section (1977-1978); Member, Environmental
Law, and Natural Resources and Energy Law Sections (1975-Present).
Rocky Mountain Mineral Law Foundation-
Trustee (1988-1992;1995-1999); Member, Publications
Committee (1984-1988); Member and Chair, Editorial Board, Rocky Mountain
Mineral Law Foundation Journal(1994-Present).
Colorado Mining
Association- Co-Chair, Air Quality Committee
(1998-2010); Member, Hardrock and Coal Committees
(1975-Present).
Colorado Hazardous Waste
Management Society- Member, Board of Directors
(1993-1999); President (1998).
Rocky Mountain Association of Environmental
Professionals- Treasurer; Member, Board of Directors (1992-1997).
American Mining Congress (now National
Mining Association)- Chairman, Air Quality
Subcommittee (1986-1989); Chairman, Section 404 Dredge and Fill Task Force
(1982-1986); Member, Environmental Committee, Solid Waste and Water Quality
Subcommittees (1978-1991).