2013 - Ultra Tech Frac Services, LLC 
          Sale to Keane Group 
          2013 - Undisclosed Private Company 
          Financial Advisor to the Advisory Board of a Private Company in Connection with the Sale of its Assets to Constellation Energy Partners 
          2011 - MatlinPatterson 
          Acquisition of a Controlling Stake in Stone Mountain Resources 
          2008 - Mark West Energy Partners - $3,000,000,000 
          Merger with Mark West Hydrocarbon, Inc. 
          2006 - Chief Oil and Gas - $2,200,000,000 
          Sale of Company to Devon Energy 
          2005 - Latigo Petroleum - $750,000,000 
          Company Sale to Pogo Producing 
          2005 - Southern California Power Producers Authority - $300,000,000 
          Purchase of Wyoming Producing Gas Properties from Anschutz Pinedale Corporation 
          2005 - USX Exploration - $350,000,000 
          Company Sale to Noble Energy 
          2004 - Houston Exploration - $449,000,000 
          “KeySpan Exchange Transactions” where HE contributed Subsidiary Seneca-Upshur Petroleum Inc. Assets and $389,000,000 Cash in exchange for 10,800,000 Shares of HE Common Stock Owned by KeySpan 
          2004 - Patina Oil & Gas - $3,400,000,000 
          Merger with Noble Energy 
          2004 - Plains Resources - $466,700,000 
          Merger with Vulcan Capital Management 
          2003 - Sacramento Municipal Utility District 
          Purchase of gas assets from El Paso Corp. 
          2002 - Pure Resources - $1,800,000,000 
          Merger with Unocal Corporation 
          2001 - Barrett Resources Corporation - $2,900,000,000 
          Merger with the Williams Companies 
          2001 - Cody Company - $230,000,000 
          Merger with Cabot Oil & Gas 
          2001 - Hallwood Energy Corporation - $268,000,000 
          Merger with Pure Resources, Inc. 
          2001 - International Paper Company - $300,000,000 
          Conveyance of its Subsidiary IP Petroleum Company, Inc. to Pure Resources, Inc. 
          2000 - Costilla Energy - $133,300,000 
          Advisor to Debtor in Chapter 11 363 Sale of Certain Assets to Louis Dreyfus Natural Gas 
          2000 - Forcenergy Inc. - $936,000,000 
          Merger with Forest Oil Corporation 
          2000 - Southern Mineral Corporation - $80,000,000 
          Merger with PetroCorp Inc. 
          2000 - Vastar Resources, Inc. - $9,061,000,000 
          Merger into Atlantic Richfield Company / BP Amoco 
          1999 - Atlantic Richfield Company - $100,000,000 
          Divestiture of ARCO Long Beach, Inc. to Occidental Petroleum Corporation 
          1999 - K N Energy, Inc. - $978,000,000 
          Merger with Kinder Morgan Energy, Inc. 
          1999 - Snyder Oil Corporation - $600,000,000 
          Merger with Santa Fe Energy Corporation 
          1999 - Titan Exploration, Inc. - $217,400,000 
          Merger with Unocal’s Permian Basin Business Unit to form Pure Energy Resources, Inc. 
          1998 - Amerac Energy - $24,000,000 
          Sale of the Company to Southern Minerals 
          1998 - Domain Energy - $250,000,000 
          Sale to Range Resources 
          1998 - Hugoton Energy Corporation - $380,000,000 
          Merger with Chesapeake Energy Corporation 
          1998 - Union Texas Petroleum Holdings - $3,539,000,000 
          Merger into Atlantic Richfield Company 
          1998 - Vastar Resources, Inc. - $470,000,000 
          Acquisition of Western Midway Company from Atlantic Richfield Company in three-company transaction involving Vastar, ARCO, and Mobil 
          1997 - Amoco Production Company - $1,000,000,000 
          Formation of a Joint Venture with Maxus Energy Corporation 
          1997 - Coda Energy - $334,000,000 
          Merger with Belco Oil and Gas 
          1997 - ConVest Energy Corporation/Edisto Resources Corporation - $172,000,000 
          Merger with Forcenergy Inc. 
          1997 - Department of Energy - $3,650,000,000 
          Asset Sale of Elk Hills to Occidental Petroleum 
          1997 - Monterey Resources - $106,000,000 
          Acquisition of McFarland Energy 
          1997 - Republic Gas Partners L.L.C. - $29,500,000 
          Merger with MidCoast Energy Resources, Inc. 
          1997 - Santa Fe Energy Corporation - $854,000,000 
          Spin-Off of Monterey Resources 
          1997 - Western Mining Corporation - $270,000,000 
          Sale of Its U.S. Subsidiary, Greenhill Petroleum Corporation, to MESA Inc. 
          1996 - Global Natural Resource Inc. - $531,000,000 
          Merger with Seagull Energy Corporation 
          1996 - Sheffield Exploration 
          Merger with TransMontaigne Oil Company 
          1996 - The Phoenix Resource Companies, Inc. - $406,000,000 
          Merger with Apache Corp. 
          1995 - Barrett Resources Corporation - $321,500,000 
          Merger with Plains Petroleum Company 
          1995 - Consolidated Oil & Gas, Inc. - $120,200,000 
          Merger with Hugoton Energy Corporation 
          1995 - Patrick Petroleum Company - $28,000,000 
          Merger with La/Cal Energy Partners into Goodrich Petroleum Corporation 
          1995 - Reunion Resources Company - $11,600,000 
          Sale of 1,450,000 Shares of Common Stock held by Parkdale Holdings Corporation, N.V. to Chatwins Group, Inc. 
          1994 - General Atlantic Resources Corporation - $195,900,000 
          Merger with United Meridian 
          1994 - K N Energy, Inc. - $430,270,296 
          Merger with American Oil & Gas Corporation 
          1994 - The Wiser Oil Company - $52,000,000 
          Acquisition of Canadian Oil & Gas Properties from Eagle Resources, Ltd. 
          1993 - Highway Pipeline Corporation - $4,000,000 
          Sale to Edge Group 
          1993 - Kirby Corporation - $24,000,000 
          Acquisition of TPT Marine Barge Division of Ashland, Inc. 
          1993 - Kirby Corporation - $50,000,000 
          Standby Underwriter in Redemption of 7¼% Convertible Subordinated Debentures 
          1993 - NERCO, Inc. - $1,200,000,000 
          Sale to Kennecott 
          1993 - Star Gas Corporation - $120,000,000 
          Sale to Petroleum Heat and Power Co. 
          1993 - The Wiser Oil Company - $58,800,000 
          Acquisition of Oil & Gas Properties from Mobil Exploration & Production U.S. Inc. 
          1992 - American Exploration Company 
          Acquisition of an Additional Interest in Canadian Conquest Exploration from The Prudential Life Insurance Corporation 
          1991 - American Exploration Company - $165,000,000 
          Acquisition of Conquest Exploration Company 
          1991 - Apache Corporation - $550,000,000 
          Acquisition of MW Petroleum Corporation from Amoco Production Company 
          1991 - Pacific Enterprises Oil Company - $50,000,000 
          Sale of Pacific Enterprises Oil Company (Netherlands) to Petron Exploratie B.V. 
          1991 - Sheffield Exploration - $3,500,000 
          Acquisition, through a Joint Venture, of an Interest in the Lignite Gas Processing Plant from OXY USA Inc. 
          1990 - Apache Corporation - $23,500,000 
          Acquisition of Certain Oil and Gas Properties from CNG Producing 
          1990 - Gas Compressors, Inc. - $80,000,000 
          Sale to First Reserve Corp. 
          1990 - Louis Dreyfus Energy Corporation - $59,000,000 
          Acquisition of Bogert Oil Company 
          1990 - Paramount Petroleum - $52,638,000 
          Structuring of Paramount 1990 Exploration Programs 
          1990 - Snyder Oil Corporation - $200,000,000 
          Merger with Snyder Oil Partners 
          1990 - Sterling Energy 
          Acquisition of Oil & Gas Properties from Bridge Oil (USA) 
          1990 - Sterling Energy 
          Acquisition of Oil & Gas Properties in Southeastern Utah from Presidio Oil Company, Grace Petroleum Corporation, and Oxford Consolidated Inc. 
          1988 - Flag-Redfern Oil Company - $86,000,000 
          Cash Merger with Kerr-McGee Corporation 
          1988 - Sabine Corporation - $339,000,000 
          Takeover Defense in Response to an Unsolicited Acquisition Attempt by Presidio Oil Company Followed by a Cash Tender Offer by Pacific Enterprises 
          1987 - Cenergy Corporation - $102,000,000 
          Takeover Defense Followed by a Merger with Conquest Exploration Company 
          1987 - Diamond Shamrock Corporation - $300,000,000 
          Private Placement of 3 million shares of Preferred Stock to Prudential Insurance Company 
          1987 - Diamond Shamrock Corporation - $340,000,000 
          Self-Tender Offer for 20 million shares of Common Stock 
          1987 - Diamond Shamrock Corporation - $392,000,000 
          Spin-off of Diamond Shamrock Refining and Marketing 
          1987 - Diamond Shamrock Corporation - $1,700,000,000 
          Takeover Defense in Response to an Unsolicited Takeover Attempt (Offer Unsuccessful) by Mesa Limited Partnership 
          1987 - Shell Oil Company - $83,000,000 
          Acquisition of Oil and Gas Properties from Union Texas Petroleum 
          1987 - The Standard Oil Company - $7,992,000,000 
          Purchase for Cash (Tender Offer) and Warrants by The British Petroleum Company, P.L.C. 
          1986 - Arkla, Incorporated - $305,000,000 
          Acquisition of Mississippi River Transmission Corporation from MidCon Corporation 
          1986 - Ashland Oil Company - $1,800,000,000 
          Takeover Defense in Response to an Unsolicited Takeover Attempt (Offer Unsuccessful) by First City Financial Corporation 
          1986 - Freeport McMoRan Inc. - $250,000,000 
          Cash Tender Offer for American Royalty Trust Units 
          1986 - Inexco Oil Company - $131,000,000 
          Merger for Common Stock with The Louisiana Land & Exploration Company 
          1986 - Occidental Petroleum Corporation - $3,000,000,000 
          Cash Tender Offer Followed by a Common Stock Merger with MidCon Corporation 
          1986 - Petro-Lewis Corporation - $800,000,000 
          Sale to Freeport-McMoRan 
          1986 - Texas Oil & Gas Corporation - $3,560,000,000 
          Merger for Common Stock with United States Steel Corporation 
          1986 - Worldwide Energy Corporation - $90,000,000 
          Acquisition by Triton Energy Corporation 
          1985 - Adobe Oil & Gas Corporation - $215,000,000 
          Merger for Common and Preferred Stock with Madison Resources, Inc. 
          1985 - American Natural Resources - $2,500,000,000 
          Cash Tender Offer by The Coastal Corporation 
          1985 - ConVest Energy Partners, Ltd. - $87,000,000 
          Exchange Offer and Solicitation of Consents for Certain Oil and Gas Properties Formed by ConVest Energy Corporation 
          1985 - May Energy Partners - $33,000,000 
          Acquisition of Partnership Interests 
          1985 - Triton Energy Corporation 
          Acquisition of Cambridge Energy Company 
          1984 - Equitable Resources, Inc. - $43,000,000 
          Merger for Cash with Union Drilling 
          1984 - Howell Corporation - $80,000,000 
          Acquisition of Howell Petroleum 
          1984 - Husky Oil Ltd. - $505,000,000 
          Sale of Husky Oil Company to Marathon Oil Company 
          1984 - Sundance Oil Company - $106,000,000 
          Merger for Cash with Societe Quebecoise d’Initiatives Petrolieres 
          1984 - Texaco Inc. - $10,100,000,000 
          Cash Tender Offer for Getty Oil Company 
          1984 - Unimar Company - $511,000,000 
          Cash Tender Offer/Merger for Indonesian Participating Certificates with ENSTAR Corporation 
          1983 - CSX Corporation - $1,070,000,000 
          Cash Tender Offer for Texas Gas Resources Corporation 
          1983 - General American Oil Company of Texas - $1,142,000,000 
          Self-Tender Followed by a Merger for Cash with Phillips Petroleum Company 
          1983 - Vanderbilt Energy - $30,000,000 
          Sale to Madison Energy 
          1982 - Conquest Exploration - $200,000,000 
          Acquisition of CanAm Partnership Interests 
          1981 - Apache Petroleum Company - $200,000,000 
          Exchange Offer of MLP Units for Partnership Interests 
          1981 - Ensource Corporation - $500,000,000 
          Exchange Offer of Common Stock for Partnership Interests 
          1981 - Texas American Energy - $27,000,000 
          Acquisition of Western Kentucky Gas 
          1980 - Energy Management - $100,000,000 
          Acquisition of Partnership Interests 
          1980 - Howell Petroleum - $76,000,000 
          Acquisition of Partnership Interests 
          1976 - Tesoro Petroleum - $100,000,000 
          Acquisition of 37% of the Common Stock of Commonwealth Oil & Refinery Co.