On January 25, 2022, the Board of Directors of Great Lakes Dredge & Dock Corporation appointed Scott L. Kornblau as Treasurer, effective immediately. Mr. Kornblau continues to also serve as the Company's Senior Vice President and Chief Financial Officer. The new appointment does not provide for any changes to Mr. Kornblau's current compensation.

On January 25, 2022, the Board of Directors of the Company appointed Todd M. Lightfoot as Vice President and Chief Accounting Officer, effective immediately. Mr. Lightfoot replaces Mr. Kornblau as principal accounting officer. Mr. Lightfoot has served as the Company's Vice President - Finance since May 2019, Director of Finance from March 2015 to May 2019 and Director of Financial Reporting from May 2013 to March 2015.

He joined the Company in 2011.