Great Lakes Dredge & Dock Corp.

Mr. Mackie has served as a member of our Board and as our President and Chief Executive Officer since 1995. He joined Great Lakes in 1978 as Corporate Counsel. In 1987, he was named Senior Vice President. Mr. Mackie earned a J.D. from Northern Illinois University and an MBA from the University of Chicago. He is a former President of the Dredging Contractors of America.

Mr. Simonelli was named Senior Vice President in February 2009. Mr. Simonelli is responsible for the Operations Support Group which includes Site Management, the Safety Health & Environmental Department, Field & Production Engineering and Risk Management. He was named a Vice President of the Company in 2002 and Special Projects Manager in 1996. He joined the Company in 1978 as a Project Engineer. Mr. Simonelli earned a BS in Civil and Environmental Engineering from the University of Rhode Island. He is a member of the Hydrographic Society, the American Society of Civil Engineers and the Western Dredging Association.

Ms. Wensel has been the Vice President, Chief Financial Officer and Treasurer of the Company since April 1999 and was named Senior Vice President in 2002. Ms. Wensel joined the Company in 1987 as Accounting and Financial Reporting Supervisor. In 1989, she was named Controller and Chief Accounting Officer. She is the current Treasurer of the Dredging Contractors of America. Ms. Wensel is a Certified Public Accountant and also has a MBA from the University of Chicago.

Mr. Johnson has been Vice President and Production Engineering/Special Projects Manager since 1997. Prior to joining the Company in 1983, he was a Project Manager with Healy Tibbits Builders. Mr. Johnson earned a BSE in Ocean Engineering from Purdue University and a graduate degree in Construction Engineering & Management from Stanford University. He is a member of the American Society of Civil Engineers.

Mr. Lowry has been the Executive Vice President and Chief Operating Officer of the Company since 1995. He joined the Company in 1978 as a Project Engineer and has since held positions of increasing responsibility in the engineering and operating areas of the Company. In 1990 he was named Senior Vice President and Chief Engineer. He is a member of the Society of American Military Engineers. Mr. Lowry received Bachelors Degree (Honors) in Civil Engineering from Brighton Polytechnic in England.

Mr. Becker has managed the Equipment Maintenance and Mechanical Engineering Departments since 1995. He joined the Company in 1984 as a Field Engineer and holds a Bachelors degree in Mechanical Engineering from the University of Illinois.

Mr. Hansen has been a Vice President and Division Manager of the Company since 1994. He joined the Company in 1977 as an Area Engineer. He was named Vice President & General Superintendent of the Company in 1991. Mr. Hansen earned a BS in Civil Engineering from Louisiana State University. He is a member of the American Society of Civil Engineers.

Mr. Gillespie was named Vice President and Special Projects Manager in 1997. He joined the Company in 1987 as a Project Engineer and previously served as a Commissioned Officer in the U.S. Army Corps of Engineers. Mr. Gillespie earned a BS in Civil Engineering from the U.S. Military Academy at West Point and a graduate degree in Environmental Engineering from the University of Tulane. He is a member of the Society of American Military Engineers.

Mr. Gillespie was named Vice President and Special Projects Manager in 1997. He joined the Company in 1987 as a Project Engineer and previously served as a Commissioned Officer in the U.S. Army Corps of Engineers. Mr. Gillespie earned a BS in Civil Engineering from the U.S. Military Academy at West Point and a graduate degree in Environmental Engineering from the University of Tulane. He is a member of the Society of American Military Engineers.

Mr. O'Hara has been a Vice President and Division Manager of the Company since 1988. He joined the Company in 1978 as Cost Accountant. He is a member of the Society of American Military Engineers. Mr. O'Hara received a BS from the University of Illinois.

Mr. Biemeck became a director of the Company following the merger. Since April 1999, Mr. Biemeck has been a private real estate investor and developer and has acted as an independent consultant. From 1994 to April 1999, Mr. Biemeck was Senior Vice President, Chief Financial Officer and Treasurer of Great Lakes Dredge & Dock Corporation. Mr. Biemeck received a Bachelor of Science degree from St. Louis University and an M.B.A from the University of Chicago and is a Certified Public Accountant and member of the Financial Executives Institute.

Madison Dearborn Partners Douglas C. Grissom, Director - A.B., Amherst College; M.B.A., Harvard Graduate School of Business Administration. Prior to joining MDP, Mr. Grissom was with Bain Capital, Inc. in private equity, McKinsey & Company, Inc., and Goldman, Sachs & Co. Mr. Grissom concentrates on investments in the communications sector and currently serves on the Boards of Directors of Cbeyond Communications, LLC, Great Lakes Dredge & Dock Corporation, Intelsat Holdings Ltd., and the Childrens' Inner City Educational Fund.

Mr. Leight became a director of the Company following the merger. He was Aldabra's chairman of the board from its inception until completion of the merger. Mr. Leight is the co-founder and a managing member of Terrapin Partners LLC (including its affiliates), a co-founder and a managing member and the chief investment officer of Terrapin Asset Management, LLC (including its affiliates), and a co-founder and a managing member and the chief investment officer of TWF Management Company, LLC (including its affiliates). Terrapin Partners, established in August 1998, is a private investment management firm focusing on private equity investing. Terrapin Asset Management, established in March 2002, focuses on the management of multi-manager hedge fund portfolios and as of January I, 2007, managed, or provided sub-advisory services for, more than $450 million of assets. TWF Management Company, established in December 2004, focuses on the management of a water industry-focused hedge fund, and as of August l, 2006 managed approximately $50 million. Mr. Leight is currently Chairman of the Board of Aldabra 2 Acquisition Corp. From September 1998 to March 1999, Mr. Leight served as the interim chief executive officer of e-STEEL LLC, an industry-specific business-to-business software enterprise, and from January 2000 to May 2002, he served as interim chief executive officer of VastVideo, Inc., a provider of special interest video content and related technology to web sites and interactive television operators. Both e-STEEL and VastVideo were Terrapin portfolio companies. From February 1995 to August 1998, Mr. Leight was employed by Gabriel Capital LP, a hedge fund with assets exceeding $ 1 billion specializing in investing in bankruptcies, under-valued securities, emerging markets, and merger arbitrage, and from February 1995 to August 1997 he served as its chief investment officer. From December 1991 to February 1995, Mr. Leight served as a managing director of Dillon Read & Co., a private investment firm, where he oversaw the firm's proprietary trading department which invested primarily in risk arbitrage and bankruptcy/distressed companies. Mr. Leight received a B.A. from Harvard College (cum laude). Mr. Leight is the cousin of Jonathan W. Berger.

Thomas S. Souleles, Managing Director - A.B., Princeton University; J.D., Harvard Law School; M.B.A., Harvard Graduate School of Business Administration. Prior to joining MDP, Mr. Souleles was with Wasserstein Perella & Co., Inc. Mr. Souleles concentrates on investments in the basic industries sector and currently serves on the Boards of Directors of Forest Products Holdings, LLC (d.b.a. Boise Cascade), Great Lakes Dredge & Dock Corporation, Magellan GP, LLC, Magellan Midstream Holdings GP, LLC, Packaging Corporation of America, US Power Generating Company, and the Children's Memorial Medical Center; and the Board of Trustees of the National Multiple Sclerosis Society, Greater Illinois Chapter.