Denali directors Richard Volk Richard Volk has been chairman of the board since February, 1999, succeeding co-founder Stephen Harcrow and became president and chief executive officer in January, 2000. Dick has a consulting practice that specializes in the formulation and implementation of long-term strategies for a varied client base. He also serves as advisory director on the board of directors of Cockrell Exploration, L.L.C., director of Osborn Heirs Company and The Yuma Companies, and has been involved in numerous other business and civic boards. Prior to forming his own consulting practice, Dick was group manager of BHP Petroleum’s Australia Division in Melbourne, Australia, from 1989 to 1991; president and chief executive officer of BHP Petroleum (Americas) from 1985 to 1989; chairman and CEO of Energy Reserves Group from 1983 to 1985, and president and CEO from 1973 to 1982. He has a petroleum engineering degree from the Colorado School of Mines and a JD from the University of Denver. Philip Burguieres Philip Burguieres has served as a director since December 1997. He is currently chairman and CEO of EMC Holdings, LLC, an investment management company specializing in the oil services, and exploration and production industries. He is also vice chairman of The McNair Group. Formerly, Philip served as chairman of the board of Weatherford International, Inc., a diversified international energy services and manufacturing company, from December 1992 to May 1998, and as its president and chief executive officer from April 1991 to October 1996. He currently serves on the boards of directors of Weatherford International, Inc., Chase Bank of Texas, Newfield Exploration Company, and McDermott International, Inc. Ernie Cockrell Ernie Cockrell has been a director since the company’s inception in December 1994. Since 1970, Ernie has served in various capacities at Cockrell Oil Corporation, an oil and gas exploration and production company, and has been its chairman and chief executive officer since 1996. He currently serves as a director of Pennzoil-Quaker State Company and Southwest Bank of Texas. Bob Elfring Bob Elfring became a director of the company on July 28, 1999. He has served as chairman of the board of directors of Welna N.V. (“Welna”), a recently acquired subsidiary of the company, since 1997 and director of Welna since 1992. He is currently managing director of Mees Pierson Investment Bank, the investment banking arm of the Netherlands/Belgium-based financial institution, Fortis. Prior to joining Mees Pierson, Bob was managing director at Amsterdamse Investeringsbank in Holland. Bob received his JD, as well as his MS and BS, in business science from the University of Groningen. Tom Simmons Tom Simmons has been a director since the company’s inception in December 1994. Tom serves as chairman of Simmons, Vedder & Co., a real estate development and investment firm that he co-founded in 1992. Before that, he spent more than 20 years with the Trammell Crow organization, most recently serving as group managing partner. Joel Staff Joel Staff became a director of the company in December 1997. Joel has served as chairman of the board since January 1996, and president and chief executive officer since July 1993, of National-Oilwell, Inc., a Houston, Texas-based company engaged in the design, manufacture and sale of machinery and equipment and the distribution of products used in oil and gas drilling and production. He is also director of the National Ocean Industries Association. He was formerly at Baker Hughes Incorporated, where he served as senior vice president and president of the drilling and production groups. Taft Symonds Taft Symonds has been a director since the company’s inception in December 1994. Since 1978, Taft has served as chairman of Maurice Pincoffs Company, a private international marketing company, as president of Symonds Trust Co., Ltd., a private investment firm. He currently serves as chairman of Tetra Technologies, Inc., a specialty chemical and chemical process company, and director of Plains Resources, Inc., a public energy company. Steve Youts Steve Youts has been a director of the company since its inception in December 1994. Since 1992, Steve has served as managing partner and chairman of Avondale Partners LP, a private investment banking firm. Prior to the formation of Avondale Partners, he served as an investment banker for Merrill Lynch & Co. and Salomon Brothers Inc. In addition, Steve serves on the board of directors of certain other private companies in which Avondale Partners holds an investment.

Denali managers Kevin Andrews Kevin Andrews has been vice president of the company since October 1998, and chief financial officer of the company since February 1996. Prior to joining the company, Kevin served as corporate development and financial manager for Moorco International, Inc., a supplier of fluid measurement and pressure control products, from November 1993 until June 1995. He also served as financial manager for EnviroTech operating group from 1991 to 1993. Kevin received his MBA and BA from The University of Tulsa and is a certified public accountant. Robert Bennett Robert Bennett was named executive vice president in January, 2000. Robert previously served as vice president of the company since September 1997, and president of Containment Solutions, Inc., a subsidiary of the company, since April 1996. Prior to his association with the company, he served as vice president of the Asia Pacific/ Middle East business units of Baker Hughes INTEQ, Singapore from 1992 to 1995. He also served as vice president of Milpark Drilling Fluids (a division of BHI) from 1989 to 1992, and was president of Densitech, a drilling fluids company, prior to its acquisition by BHI. Robert has a BS in chemistry from Sam Houston State University. Lee Orr Lee Orr is vice president of the company, and president of Specialty Solutions, Inc., a subsidiary of the company, since May 1997. Prior to joining the company, Lee was vice president and general manager of EnviroTech Molded Products from 1995 to 1997, general manager of EnviroTech Rubber Engineering from 1993 to 1995, and vice president – finance for BGA International from 1991 to 1993. He has an MBA from The University of Texas at Austin and a BBA from Abilene Christian University. Hans Siers Hans Siers became vice president on July 28, 1999. He is vice president of Welna Operations and has been the managing director of Welna since July 1998. Hans was previously managing director of a privately held international construction company specializing in underground and offshore pipeline installation. Prior to that, he was managing director for 12 years of a European civil construction and offshore contracting company. He began his career at ABN AMRO in Amsterdam and received his MBA and BSc in economics and business administration from the University of Rotterdam. Cathy Smith Cathy Smith has served as vice president since October 1998 and general counsel since January 1996. Cathy was employed at BHI from July 1989 to August 1995, most recently as general counsel of EnviroTech. Prior to joining BHI, she worked for the law firm of Thelen, Marrin, Johnson & Bridges from June 1986 to July 1989. Cathy received her JD from the University of Houston.