“Myths, Fables, Fairy Tales & Science: The Uses & Abuses of Modeling in Environmental Litigation,” AEHS, San Diego, California, March 17, 2011

“NEPA and EIS,” Law Seminars International, Phoenix, Arizona, March 7, 2008

“Climate Changes Everything: What You Need to Know Regarding Emerging Regulatory & Litigation Issues Concerning Global Warming,” Steptoe & Johnson LLP Seminar, Phoenix, Arizona, February 8, 2008

“History of the Environmental Quality Act: Past challenges and the beginning of ADEQ,” The

20th Anniversary of the Environmental Quality Act and ADEQ: Assessing and Protecting Arizona’s Water Quality, The University of Arizona, Phoenix, Arizona, June 5, 2007

“The Drinking Water Industry and Toxic Tort Liability: What the Future Holds,” The 17th Annual AEHS Meeting and West Coast Conference on Soils, Sediments, and Water, San Diego, California, March 19-22, 2007

“Proven Strategies for Working with Environmental Agencies, the Media and Adversary Groups,” Current and Emerging Environmental Law Issues, Scottsdale, Arizona , December 7, 2006

“Developments in Toxic Tort Liability for Drinking Water,” Water Law & Policies: A Symposium, Tucson, Arizona, October 6-7, 2006

“Can Groundwater Contaminant Flow Model Using Public Domain Software Constitute ‘Junk Science’ in a Court Proceeding?”, National Groundwater Association, Groundwater Resources Association of California and the Arizona Hydrological Society, Phoenix, Arizona, February 20-21, 2003

“Is the Transect Method for Determining the Mass Flux of a Contaminant ‘Junk Science?’”, The 18th Annual Contaminated Soils Conference, Amherst, Massachusetts, October, 2002

“Environmental Tips for Corporate Counsel,” Maricopa County Bar Association Corporate Counsel Division, Phoenix, Arizona, June 28, 2002

“Corporate Environmental Compliance-Survival in the 21st Century,” The First Biennial Symposium on Scientific Issues Related to Management of Landfills in Arid and Semi-arid Regions, Arizona Hydrogeologic Society, Tucson, Arizona, June 7, 2002

“Environmental Compliance-Why It Is Important to Corporate America and How It Can Be Achieved,” Multi-State Working Group/EPA “Learning Together Workshop,” Orlando, Florida, June 4, 2002

“The Trial of an MTBE Groundwater Contamination Case,” The 12th Annual West Coast Conference on Contaminated Soils, Sediments and Water, The Association for Environmental Health and Sciences and the United States Navy, San Diego, California , March 18-21, 2002

“Competing Approaches to Compliance Innovation: What Bait for What Fish?”, U.S. Environmental Protection Agency and the Multi-State Working Group, San Diego, California, June 5-6, 2000

“Staying Afloat in the Desert, Municipal Environmental Compliance Seminar,” Dames & Moore and Steptoe & Johnson LLP, Phoenix, Arizona , October 9, 1997

“Sale of Contaminated Property: A Source of Increased Shareholder and Taxpayer Value,” Coopers & Lybrand, Geraghty & Miller and Steptoe & Johnson LLP, Phoenix, Arizona, September 24, 1996

“Redeveloping Contaminated Land: A Dirty Deal Comes Clean,” Meyer, Hendricks, Victor, Ruffner & Bivens, Geraghty & Miller and Jamieson & Gutierrez, Phoenix, Arizona, June 9, 1995

“Arizona and the Environment: Where Does DEQ Go From Here?”, State Bar of Arizona Environmental and Natural Resources Law Section, Phoenix, Arizona, December 9, 1994

“Special Issues in Environmental Law,” State Bar of Arizona Environmental and Natural Resources Law Section, Phoenix, Arizona, September 23, 1994

“Landfills and Groundwater Quality in Arizona: An Attorney’s Perspective,” 29th Annual Conference & Symposium, American Water Resources Association, Tucson, Arizona, August 31, 1993

“The Federal Experience: Settling Under CERCLA, Negotiating with EPA, Administrative vs. Judicial Settlements and Standard Form Documents,” 3rd Annual CLE by the Sea, State Bar of Arizona, San Diego, California, July 30, 1993

“Overview of Arizona’s Surface Water Quality Standards,” Arizona Water Law Conference, CLE International, Scottsdale, Arizona May 6-7, 1993

“Preserving Arizona’s Environmental Heritage,” 59th Arizona Town Hall, Grand Canyon, Arizona, October 27-30, 1991

“A Ticking Time Bomb: Land Use and Development Implications of Superfund Sites,” Roy P. Drachman Institute (University of Arizona), Arizona Department of Environmental Quality, Arizona Department of Water Resources, Arizona Land Department and the Urban Land Institute of Washington, D.C., Phoenix, Arizona, October 3-4, 1991

“The 1990 Federal Clean Air Act Amendments: Their interpretation, Impacts and Implications for Arizona,” The Commission on the Arizona Environment with the Arizona Lung Association and the State Bar of Arizona Environmental and Natural Resources Law Section, Mesa, Arizona, September 26-27, 1991

“Municipal Environmental Liability,” International City Management Association, Scottsdale, Arizona, January 10, 1991

“The Innocent Purchaser: CERCLA/SARA and Superfund Liability,” State Bar of Arizona Environmental and Natural Resources Law Section, Scottsdale, Arizona, November 9, 1990

“Risky Business,” The Financial Forum: Arizona, October 17, 1990

“Environmental Liability,” Maricopa County Bar Association Annual Convention, Phoenix, Arizona, October 5, 1990

“Municipal Environmental Liability,” League of Arizona Cities & Towns Annual Convention, Oro Valley, Arizona, September 21, 1990

“Municipal Environmental Liability,” Arizona City Attorneys Association Environmental Seminar, Prescott, Arizona, June 29-30, 1990

“The Resource Conservation and Recovery Act (RCRA): “The Teenage Years,” State Bar of Arizona Environmental and Natural Resources Law Section, Scottsdale, Arizona, April 14, 1989

“Remedial Actions and Responsibility for Cleanup of Contaminated Water Supplies,” Arizona State University College of Law Alumni Association Water Law Seminar, Tempe Arizona, October 15, 1988

“The Innocent Purchaser: CERCLA/SARA and Superfund Liability,” State Bar of Arizona Environmental and Natural Resources Law Section, Scottsdale, Arizona, March 11, 1988

“Water Quality Assurance Revolving Fund: The Arizona Superfund,” Hazardous Waste in Arizona Seminar co-sponsored by the State Bar of Arizona Environmental and Natural Resources Law Section and National Business Institute, Inc., Phoenix, Arizona, June 16, 1988

“SARA’s Impact on Real Estate and Business Acquisitions,” Utah State Bar Natural Resources Section and Natural Resources Law Forum, J. Reuben Clark Law School, Brigham Young University, Provo, Utah, February 26, 1988

“Hazardous Substance Liability Seminar,” International Association of Corporate Real Estate Executives, Sunbelt Regional Meeting, April 30, 1987

“Hazardous Waste Laws and Real Estate Transactions,” State Bar of Arizona Real Estate Section, April 29, 1987

“Federal and State Hazardous Substance Liability Issues,” Federal Bar Association, Arizona Chapter, April 23, 1987

Wall Street Meets Corporate Arizona, Scottsdale, “Hazardous Waste Laws and Their Affect on Owners of Real Property, Transferees of Real Estate and Lenders in Loan Transactions,” State Bar of Arizona Real Estate Section, March 20, 1987

“The Hazardous Waste Laws and Their Applicability to Lenders in Loan Transactions,” State Bar of Arizona Corporate, Business and Banking Section, January 21, 1987

“Superfund Amendments New Hazardous Waste Cleanup Requirements: What the New Superfund Law Says and How It Will Be Implemented,” American Bar Association, local commentator, January 15, 1987

“Legislative Alternatives,” American Farm Bureau Federation Seminar, Atlanta, Georgia, November 18, 1986

“Arizona’s New Environmental Quality Act,” State Bar of Arizona, October 9, 1986

“Strategies for Protecting Groundwater,” American Farm Bureau Federation, Board of Directors Subcommittee on Groundwater Pollution, May 20, 1986

“Hazardous Substances Liability Seminar,” Jennings, Strouss & Salmon, February 13, 1986

“The State Legislative Agenda: Environmental Issues,” Executive Seminar, Wisconsin Association of Manufacturers and Commerce, October 16, 1985

“Impact of Environmental Regulation on Real Estate Transactions,” Wisconsin Bar Association, September 10-11,1985

“Wisconsin Real Estate Law and Environmental Regulation,” Wisconsin Bar Association, March 13-14, 1985

“Industry Lobbying in State Legislatures,” Institute of Politics, John F. Kennedy School of Government, Harvard University, November 7, 1984

“Wisconsin Environmental Outlook,” Educational Forum on Groundwater Protection, National Electrical Manufacturers Association, September 11, 1984

“New Developments and Issues in Solid Waste Management,” University of Wisconsin Extension, September 29, 1983

“Land Disposal of Solid Waste,” Judicial Conference, Supreme Court of Wisconsin, September 21, 1983

“Environmental Law of the General Practitioner,” Wisconsin Bar Association, July 27-28, 1983

“How to Approach and Cope with Environmental Issues in Wisconsin,” Environmental Law Conference, Wisconsin Association of Manufacturers and Commerce, May 24, 1983

“Pesticide Impacts on Groundwater: The Agribusiness Perspective,” Wisconsin Fertilizer, Aglime and Pest Management Conference, January 19, 1983

“Solid Waste Sitting in Wisconsin,” Wisconsin Towns Association, 1982 Town Lawyers Institute, May 7, 1982

“Overview of Environmental Laws and Regulations in the 1980’s: A Perspective from the Private Sector,” The American Foundrymen’s Society and the Cast Metal Institute, June 19, 1981

“The Wisconsin Model: A Consensus Approach,” Task Force Conference on Environmental Disputes, Center for Public Resources, May 1, 1981

“Environmental Regulation in the 1980’s: A Perspective from the Private Sector,” National Association of Name Plate Manufacturers, September 29, 1980

“Wisconsin’s New Solid and Hazardous Waste Management Laws,” Wisconsin Bar Association, September 10-11, 1980

“Do You Own the Land You Plan to Develop or Use?: The Ordinary High Water Mark Doctrine,” Wisconsin Bar Association, October 12-13, 1978

“User Changes and Their Impact on Business,” Wisconsin Association of Manufacturers and Commerce, July 13, 1978

“Wisconsin Environmental Policy Act: Association, June 22, 1978

“Industry and the Environment,” Wisconsin Bar Association, August 24, 1977

“The Paper Industry and Our Environment,” Mt. Sinai Medical Center, November 11, 1976

“Environmental Problems Facing Wisconsin Business,” Madison Public Schools, Chamber of Commerce, June 15, 1976

“PCBs: The Industrial Dilemma,” Wisconsin Environmental Health Association, April 29, 1976

“Symposium on Issues, Relating to Environmental Protection and the Economy,” Wisconsin Bar Association, January 30, 1976

“The Creation and Practical Application of Environmental Laws,” University of Wisconsin Extension, Department of Engineering, June 9, 1975

“User Fee Concerns of Industrial and Commercial Users,” Southeastern Wisconsin Regional Planning Commission, July 18, 1974

What It Is and Where It Stands,” Wisconsin Bar