Financiers, Private Equity and Institutional Investors
Aetna Life Insurance Co., Hartford, CT
AIG Financial Products, Inc., Westport, CT
The Blackstone Group, New York, NY
Connecticut Mutual Insurance Co., Hartford, CT
Denham Capital Management, Houston, TX
Deutsche Bank, New York, NY
E.F. Hutton & Co., New York, NY
Energy Investors Funds, Inc., Boston, MA
First Interstate Bank, Casper, WY
FLAG Capital Management, LLC, Boston, MA
Greenhill Capital Partners, LLC, New York, NY
Harvard Management Company Inc., Boston, MA
J.P. Morgan Capital Corporation, Chicago, IL
Kern Partners, Ltd., Calgary, Alberta
Lime Rock Partners, Westport, CT
Magnetar Capital LP, Evanston, IL
Morgan Guaranty Trust Co., New York, NY
Natural Gas Partners, Houston, TX
New York Life Insurance Company, New York, NY
Pine Brook Road Partners, LLC, New York, NY
Riverstone Holdings LLC, New York, NY
Societe Generale Securities Corporation, New York, NY
Soros Funds Management, New York, NY
Torch Energy Advisors, Inc., Houston, TX
E.M. Warburg. Pincus & Co. Inc., New York, NY
Weintraub Capital, San Francisco, CA
Wellspring Capital Management, LLC, New York, NY

Oil Companies
Akhtyrka Oil Production Association, Ukraine
Alberta Energy Company Ltd., Calgary, Alberta
Amoco Eurasia Petroleum Company, Houston, TX
BHP New Ventures, Inc., Houston, TX
Callon Petroleum Co., Natchez, MS
Continental Resources, Inc., Enid, OK
CPC Corporation, Taiwan
Encana International (Gulf of Mexico), Inc., Houston, TX
Equitable Resources Energy Corporation, Pittsburgh, PA
The Eastern Group, Alexandria, VA
Gryphon Exploration Company, Houston, TX
King Ranch Oil and Gas, Inc., Houston, TX
Kuwait Energy Company, Salmiya, Kuwait
Norcen Energy Resources Ltd., Calgary, Alberta, Canada
Oil and Gas Mine Company, Sana'a, Republic of Yemen
Ostravsko-Karvinske Doly, a.s., Ostrava, Czech Republic
Pardee Exploration Co., Houston, TX
Platinum Exploration Inc., Midland, TX
Plains Resources, Houston, TX
Pruet Oil Co., Jackson, MS
PT. B.I.P. Energimas, Jakarta, Indonesia
Rosetta Exploration Inc., Calgary, Alberta
Snyder Oil Partners, L.P., Fort Worth, TX
Trinidad Exploration and Development, Ltd., Port of Spain, Trinidad
Xcite Energy, Guilford, UK

Utility Companies
Constellation Energy, Houston, TX
Destec Energy, Houston, TX
Equitable Resources Energy Corporation, Pittsburgh, PA
Fuel Resources, Inc. (Brooklyn Union Gas Company), Brooklyn, NY
Southern Connecticut Gas, Orange, CT
Kinder Morgan, Inc., Houston, TX
New England Energy, (New England Electric), Westborough, MA
Vulcan Power Company, Reno, NV

Industrial End-Users
The Gillette Company, Boston, MA
Westvaco Corp., New York, NY

Government Agencies
Agencia Nacional de Hidrocarburos (ANH), Bogota, Colombia
Export-Import Bank of the United States, Washington, D.C.
Internal Revenue Service, New York, NY, Los Angeles, CA
New York State Energy Research Development Authority (NYSERDA), Albany, NY
U.S. Department of Justice, Washington, D.C

Law Firms
Bernstein Liebhard LLP, New York, NY
Bernstein Litowitz Berger & Grossmann LLP, New York, NY
Chimicles, Jacobsen & Tikellis, Attorneys at Law, Wilmington, DE
Cohen, Milstein, Hausfeld & Toll, PLLC, Seattle, WA
Crowley-Fleck Law Offices, Billings, MT
Dagger Johnston Miller Ogilvie & Hampton, LLP, Lancaster, OH
Kirkpatrick & Lockhart, Attorneys at Law, Pittsburgh, PA
Lowenstein Sandler LLP, Roseland, NJ
McGuireWoods, Ross & Hardies, Chicago, IL
Milberg Weiss Bershad Hynes & Lerach LLP, New York, NY
Robbins Geller Rudman & Dowd LLP, Melville, NY
Siskind, Cromarty, Ivey and Dowler LLP, Toronto, Ontario
Susman Godfrey, Attorneys at Law, Houston, TX
Yetter & Warden LLP, Houston, TX

Investigative and Competitive Research Services
Andrews International, Inc., Miami, FL
Coleman Research Group, Inc.
Gerson Lehrman Group, Inc.
Kroll Associates, Inc., Los Angeles, Washington, D.C., Miami, and New York
PriceWaterhouseCoopers LLP, Los Angeles, CA
Risk Solutions & Investigations, Los Angeles, CA

Not-for-Profits/Charitable Institutions
American Bible Society, Philadelphia, PA
Church of Jesus Christ of the Latter Day Saints, Salt Lake City, UT
Disabled American Veterans, Cold Spring, KY
Franklin & Marshall College, Lancaster, PA
Lutheran Community Foundation, Minneapolis, MN