Mention M. Rosenblatt & Son, Inc. (MR&S), to anyone who has been involved with the marine industry since the mid-20th Century and one would think of the naval architecture and marine engineering firm that has held court from its homebase in New York City since just after the heydays of WWII. Its foundation, which was literally constructed by Mandell Rosenblatt and his son, Lester, has remained at the forefront of the industry and weathered the constant cyclical changes of an industry that is now often dominated by consolidation. By Regina P. It's a good thing that Mandell Rosenblatt lived near Brooklyn's Prospect Park. As a young man of about 14…