When Harry Knowles Hollenbeck was born on 13 April 1876, in High Hill, Muskingum, Ohio, United States, his father, Leander B. Hollenbeck, was 32 and his mother, Matilda Ann West, was 28. He had at least 4 sons and 2 daughters with Olevia Mahaley Gregg. He lived in Detroit Ward 15, Detroit, Wayne, Michigan, United States in 1910 and Royal Oak, Oakland, Michigan, United States in 1920. He died on 30 June 1937, in Detroit, Wayne, Michigan, United States, at the age of 61, and was buried in Buffalo, Guernsey, Ohio, United States.