When did the father of George J. Gruen pass away ?
Dietrich Gruen Dietrich Gruen (February 22, 1847April 10, 1911), was a German born watchmaker who emigrated to the United States in the 1860s and later founded the Gruen watch Company.
Richard Gruenther Richard Gruenther (December 14, 1924 – March 18, 2015) was an American modern pentathlete. He competed in the 1948 Summer Olympics.