In 1919, Ingber was invited by millionaires Alpheus Geer and Hiram Mallison to manage Stillman's Gym.
When Ingber came along, the gym was actually named the Marshall Stillman Athletic Club.
[citation needed] He had a sign that read: "Anyone caught stealing will be barred for life".
Many famous people trained there, mainly boxers: Jack Dempsey, Georges Carpentier, Primo Carnera, Fred Apostoli, Joe Louis and Rocky Marciano were some of the famous world champions who trained at Stillman's Gym.
Stillman's Gym was featured in several motion pictures, including the Rocky Graziano biographical film Somebody Up There Likes Me (1956) and It's Always Fair Weather (1955), which has a musical number set in the gym, "Baby You Knock Me Out," featuring Cyd Charisse.