Entering the United States Navy during World War II , after the war he served as a presiding judge in 1947 for the Einsatzgruppen Trial in US military court at Nuremberg .
Entering the United States Navy during World War II , he served in the military justice system . 
 Beginning in 1947 , he served as a presiding judge for the Einsatzgruppen Trial in US military court at Nuremberg .