Career
Engelhard"s brother Richard was an elite long-distance runner in the 1920s. In 1932 Engelhard married Ruth Becker, a German runner who set three world records in the 80 m hurdles and 4 × 200 m relay. He wrote books Leistungsschulung des Mittelstrecklers (How to coach middle distance runners, 1937) and Der Mittelstreckenlauf (Middle distance running, 1950).