Greg Sommer, managing director, Citigroup Inc.

Recent deals: ConocoPhillips Co. on its acquisition of Burlington Resources Inc. for $35 billion, Varco International Inc. on its $2.4 billion sale to National Oilwell Inc., Todco on its $2.3 billion sale to Hercules Offshore Inc. and Loews Corp. on its $1.1 billion purchase of Gulf South Pipeline LP from Entergy-Koch LP.

Greg Weinberger, managing director, Credit Suisse Group

Recent deals: Anadarko Petroleum Corp. on its $23 billion purchases of Kerr-McGee Corp. and Western Gas Resources Inc., Grant Prideco Inc. on its $7.4 billion acquisition by National Oilwell Varco Inc., Vintage Petroleum Inc. on its $3.8 billion sale to Occidental Petroleum Corp. and Cie. Générale de Géophysique SA on its acquisition of Veritas DGC Inc. for $3.1 billion.

Jonathan Cox, managing director, Deutsche Bank AG

Recent deals: Marathon Oil Corp. on its $6.2 billion acquisition of Western Oil Sands Inc., TGS-Nopec Geophysical Co. LP on its $3 billion purchase of Wavefield Inseis ASA, Precision Drilling Trust on its $2 billion offer for Grey Wolf Inc. and Giant Industries Inc. on its $1.5 billion sale to Western Refining Inc.

Bill Montgomery and Steve Daniel, managing directors, Goldman, Sachs & Co.

Recent deals: ConocoPhillips Co. on its purchase of Burlington Resources Inc. for $35 billion, Transocean Inc. on its $18 billion merger with GlobalSantaFe Corp., National Oilwell Varco Inc. on its $7.4 billion acquisition of Grant Prideco Inc., Shell Canada Ltd. on its $5.9 billion acquisition of Duvernay Oil Corp. and Veritas DGC Inc. on its sale to Cie. Générale de Géophysique SA for $3.1 billion.

Greg Pipkin, managing director, Lehman Brothers Inc.

Recent deals: Kerr-McGee Corp. on its $18 billion sale to Anadarko Petroleum Corp., Chevron Corp. on its $17 billion purchase of Unocal Corp., Vintage Petroleum Inc. on its $3.8 billion sale to Occidental Petroleum Corp., Plains Exploration & Production Co. on its $3.6 billion purchase of Pogo Producing Co. and Houston Exploration Co. on its $1.6 billion sale to Forest Oil Corp.

Jon Hughes, managing director, Merrill Lynch & Co.

Recent deals: Western Gas Resources Inc. on its $5.2 billion sale to Anadarko Petroleum Corp., Occidental Petroleum Corp.'s $3.8 billion acquisition of Vintage Petroleum Inc., Petrohawk Energy Corp. on its $1.6 billion merger with KCS Energy Inc. and, Delta Petroleum Corp. on a $684 million investment in the company by billionaire investor Kirk Kerkorian's Tracinda Corp.

Tom Langford, managing director, Morgan Stanley

Recent deals: Burlington Resources Corp. on its $35 billion buyout by ConocoPhillips Co., Unocal Corp. on its $17 billion sale to Chevron Corp., Premcor Inc.'s $6.9 billion sale to Valero Energy Corp. and Western Gas Resources Inc. on its $3.8 billion acquisition by Anadarko Petroleum Corp.

Doug Petno and Laurence Whittemore, managing directors, J.P. Morgan

Recent deals: Dominion Resources Inc. on the sale of most of its natural gas producing assets to Loews Corp.XTO Energy Inc. for $6.5 billion and Smith International Inc. on its $3.2 billion acquisition of W-H Energy Services Inc., Quicksilver Resources Inc. on its $1.3 billion purchase of properties in the Barnett Shale from Chief Resources LLC, Hillwood Oil & Gas LP and Collins & Young LLC.

Steve Trauber and Dan Ward, managing directors, UBS

Recent deals: Anadarko Petroleum Corp. on its $23 billion acquisition of Kerr-McGee Corp. and Western Gas Resources Inc., W-H Energy Services on its $3.2 billion sale to Smith International Inc., Hercules Offshore Inc. on its $2.8 billion acquisition of Todco, Dresser Inc. on its $2.4 billion sale to Riverstone Holdings LLC and Atlas Energy Resources LLC on its $1.225 billion acquisition of DTE Gas & Oil Co. from DTE Energy Co.