In addition to chess, Mr. DuPuy was a renowned international collector and exhibitor of stamps. He was a member of the U.S. Philatelic Society and won the United States Stamp
Society’s Hugh M. Southgate Trophy for his exhibit of 1861 30- and 90-cent stamps. He was a member and a past board member of the American Philatelic Foundation and several other clubs. Other interests included chess, model trains and antique automobiles.
He died young (age 63) on May 16, 2010, due to surgery complications. In 2011 Keth sold his Belgium collection