The promotion of Kenneth D. Griffin to vice president of Mississippi Marine Towboat Corporation was announced recently by D. John Nichols, president of the Greenville, Miss., firm which specializes in new construction and repair of inland and offshore marine equipment.

Mr. Griffin joined Mississippi Marine in September of 1973 as controller-purchasing manager. With this new appointment, Mr. Griffin's duties and responsibilities will be broadened to assist in general day-to-day management, in addition to being directly responsible for the accounting and purchasing departments.