When Leroy Joseph Einhaus was born on 31 December 1914, in Quincy, Adams, Illinois, United States, his father, Anton Henry Einhaus, was 45 and his mother, Wilhelmina Funke, was 41. He married Constance Elizabeth Dieker on 11 May 1945, in Quincy, Adams, Illinois, United States. They were the parents of at least 1 daughter. He died on 10 May 2003, in Quincy, Adams, Illinois, United States, at the age of 88.