Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD), the largest provider of dredging services in the United States and a major provider of commercial and industrial demolition and remediation services, today announced that Maryann Waryjas has been appointed Senior Vice President, Chief Legal Officer and Corporate Secretary effective immediately. Ms. Waryjas joins Great Lakes from Katten Muchin Rosenman, LLP (“Katten”) where she was a partner and Co-Chair of the firm’s Corporate Governance and Mergers and Acquisitions Practices. Ms. Waryjas has broad experience in U.S. and overseas business, contract and dispute matters. She has been an advisor to company boards and led numerous M & A transactions. She possesses demonstrated skills in SEC compliance, dispute resolution, strategic business initiatives and enterprise risk management. She will report to Chief Executive Officer Jonathan Berger. “Maryann is a great addition to our executive team,” Berger said. “She brings a wealth of experience to help us execute on the Company’s strategic growth plan, which includes expanding into new markets. We are clearly in a growth mode and adding the senior expertise of Maryann as Chief Legal Officer will aid in achieving our initiatives.” Ms. Waryjas was a partner at Katten since January 2000, where she focused on areas of corporate and securities law, private equity transactions, corporate governance and executive compensation. She served two consecutive terms on Katten’s Board of Directors. Prior to Katten, Ms. Waryjas was a partner at the Chicago offices of Jenner & Block and Kirkland & Ellis. She received her B.S. degree, magna cum laude, from Loyola University and her J.D. degree, cum laude, from Northwestern University School of Law. Additionally, we are pleased to announce that Kathleen LaVoy has been promoted to Vice President & General Counsel – Dredging Operations. As we continue to plan for growth in our dredging operations, both domestically and internationally, we require the focused attention and operational knowledge Ms. LaVoy will bring to this new role. Ms. LaVoy began employment in the legal department with Great Lakes in 2007. Ms. LaVoy received her J.D. degree cum laude from Northwestern University School of Law and was an associate in the litigation department of the Chicago law firm Winston & Strawn LLP following graduation. Ms. LaVoy earned a B.S. degree with distinction in Business Administration from the University of North Carolina – Chapel Hill. The Company Great Lakes Dredge & Dock Corporation is the largest provider of dredging services in the United States and the only U.S. dredging company with significant international operations. The Company is also one of the largest U.S. providers of commercial and industrial demolition services primarily in the Northeast. The Company owns a 50% interest in a marine sand mining operation in New Jersey that supplies sand and aggregate for road and building construction and a 50% interest in an environmental service operation with the ability to remediate soil and dredged sediment treatment. Great Lakes employs over 150 degreed engineers, most specializing in civil and mechanical engineering, which contributes to its 122-year history of never failing to complete a marine project. Great Lakes has a disciplined training program for engineers that ensures experienced-based performance as they advance through Company operations. Great Lakes also owns and operates the largest and most diverse fleet in the U.S. industry, comprised of over 200 specialized vessels.