When did the father of George J. Gruen pass away ?
George J. Gruen George J. Gruen (1877–1953) was an American watchmaker who managed the Gruen Watch Co. He was the second son of the founder Dietrich Gruen.
Richard Gruenther Richard Gruenther (December 14, 1924 – March 18, 2015) was an American modern pentathlete. He competed in the 1948 Summer Olympics.