"The Role of Vehicle Emission Inspection and Maintenance in Maryland Under the Clean Air Act." Delivered to the Maryland House of Delegate, Environmental Matters Committee, July 11, 1995.
"Economic Issues in Recycling Solid Waste." Delivered to the Maryland House of Delegates, Environmental Matters Committee, September 1991.
Panels and Symposiums:
Air Quality Subcommittee, Scientific and Technical Advisory Committee on the Chesapeake Bay, U.S. Environmental Protection Agency (EPA), Chesapeake Bay Program, 1993 - 2002.
Clean Air Advisory Committee, Innovative and Incentive-Based Policies Workgroup, Mobile Sources Technical Advisory Subcommittee, U.S. Environmental Protection Agency (EPA), 1994 - 2002.
Board on Environmental Studies and Toxicology, Commission on Life Sciences, Committee to Review the Effectiveness of Vehicle Emission Inspection and Maintenance Programs, 2000 - 2001.
Discussant, Meetings of the American Economic Association, "Responses of Firm and Agencies to Environmental Regulation," New Orleans, LA, January 2001.
Presenter, Meeting of the National Academy of Sciences (NAS), "Research on Vehicle Emissions: Costs and Effectiveness of I/M Programs," Washington, D.C., Fall 2000.
Chair of session, European Association of Environmental and Resource Economics (EAERE), Rethymnon, Crete, Greece, July 2000.
Co-Chair of Mobile Source Innovative and Incentive Policies Workgroup, U.S. Environmental Protection Agency (EPA), 1997 - 1999.
Chair of session, and speaker, Clean Air Conference, Aspen, CO, September 1999.
Review Panel, University of California Santa Barbara, "The Petroleum Extraction Industry in Ventura, Santa Barbara, and San Luis Obispo Counties California: Economic, Fiscal, Institutional, Social and Historic Considerations," 1997 - 1998.
Chair for "Externalities and the Automobile," Association of Environmental and Resource Economists, at the American Economic Association Meetings, San Francisco, CA, January 1996.
Contributed Papers Selection Committee for Annual Meetings, Association of Environmental and Resource Economics (AERE), 1993-1995.
"Shifting Gears: New Directions for Cars and Clean Air," meeting of urban transportation policy makers and academics, Atlanta, GA, October 1994.
Moderator for Focus Groups, "Public Perception and Acceptance of Emission Fees in Southern California," Los Angeles, CA, October 1994.
Chair for "Economic Incentive Policies for Natural Resources," Association of Environmental and Resource Economists, at the American Economic Association Meetings, Boston, MA, January 1994.