Mark retired in 2008 as Senior Director of Global Product Strategy at GlaxoSmithKline pharmaceuticals after a 37-year career that spanned organic chemistry, product marketing and strategic planning.
Mark’s philatelic collecting interests focus primarily on the postal history of Boston and Essex County, Mass; the NY Postmaster Provisional; and transatlantic mail. He has written articles for the Chronicle of the U.S. Classic Postal Issues; the Collectors’ Club Philatelist; the American Philatelic Congress Book; the India Post; and the Massachusetts Spy. Mark is a member of the American Philatelic Society; the U.S. Philatelic Classics Society (as Asst. Treasurer); the Postal History Society; the Carrier & Locals Society; the New York Collectors Club; and the Greater Philadelphia Stamp & Collectors Club. He serves as a member of the boards of the Philatelic Foundation; the U.S. Philatelic Classics Society; the Philadelphia National Stamp Exhibition; and the Institute of Analytical Philately.