After his professional career, Hart became a referee and judge with the California State Athletic Commission, working in greater Los Angeles area clubs during the 1940s, 50s, and 60s.
Notable Fights Worked
- Both Davey Moore-Hogan (Kid) Bassey World Featherweight Title fights
- Both Jose Becerra-Alphonse Halimi - World Bantamweight Title fights
- Gene Fullmer-Sugar Ray Robinson (3rd bout) - NBA Middleweight Title
- Emile Griffith-Gaspar Ortega - World Welterweight Title
- Muhammad Ali-Archie Moore
- Vicente Saldivar-Raul Rojas - World Featherweight Title