Mark J. Rohn began his career in the maritime industry in May, 1978, employed as a vessel agent with N.M. Paterson & Sons. His career path continued, in a variety of vessel operations, with the M.A. Hanna Company starting in June, 1979 through February, 1992. At which time, Mr. Rohn became the Director of Operations for The Great Lakes Towing Company until March, 1994.

in 1994, Mr. Rohn joined the Oglebay Norton Company, working in a variety of vessel operations and eventually serving as the Vice President of Terminal Operations and Director of Human Resources, leaving the organization in 2001.

Mr. Rohn began his career at Grand River Navigation Company in April, 2001 and currently serves as president, Mr. Rohn serves on the Board of Visitors of the Great Lakes Maritime Academy, member of the lake Carriers Association, Propeller Club, Port of Cleveland, SNAME and ISMA, Cleveland lodge #4. Mark and his wife, Donna, have three sons.