James A. McQuilling, president of Midland Marine Corporation, has announced the appointment of Walter J. Gregorek to its New York sales staff. Mr. Gregorek is a 1966 graduate of the United States Merchant Marine Academy, and has a master's degree in business from Fairleigh Dickinson University. His experience includes ship operation, engineering management, and ship repair marketing. His last position prior to joining Midland Marine was assistant vice president for marketing in the New York office of Curacao Drydock Company.