The Board of Directors of Great Lakes Dredge & Dock Corporation the largest provider of dredging services in the United States and a major provider of environmental and remediation services, announced today that Ryan Levenson has been appointed to the Board of Directors, effective December 27, 2016. Mr. Levenson has also been appointed to the Nominating and Corporate Governance Committee. Concurrent with the 2017 Annual Meeting of Shareholders, the size of the class of directors of the Board with a term expiring at such meeting shall automatically decrease from three to two members. In addition, subject to certain exceptions, Great Lakes has agreed to include Mr. Levenson on the Company’s slate of nominees for the election of directors at the 2017 Annual Meeting.