In 1919, Ingber was invited by millionaires Alpheus Geer and Hiram Mallison to manage the Stillmans Gym. When Ingber came along, the gym was actually named the Marshall Stillman Athletic Club. In the late 1920s, the gym changed its name. Patrons used to think Ingber's last name was Stillman, because of this, they greeted him as Mr. Stillman. Stillman, described as moody and acid, among other things, by boxing historians and writers, disliked having to correct everyone who called him Mr. Stillman, so eventually he changed his name legally from Louis Ingber to Lou Stillman.
Stillman was famous for keeping his gym as unsanitary as possible: He allowed the public to smoke in a closed windows atmosphere, and he absolutely required for the gym floors to go uncleaned sometimes for years. He said: The golden age of prizefighting was the age of bad food, bad air, bad sanitation, and no sunlight. I keep the place like this for the fighters own good. If I clean it up theyll catch a cold from the cleanliness.
Stillman carried a gun around his waste when he was at the gym. He had two guards watching the doors, to make sure everyone paid the 25 cents price to get in and watch the boxers practice. He had a sign that read: Anyone caught stealing will be barred for life. When French dancer Jeanne Lamar showed up at Stillman's to train in 1922, Stillman told her that there were no facilities for girls in his gym, but she stood around and used the gym to get in shape anyways. However, Stillman has been also described by historians as a person who did not discriminate based on sex gender.
Many famous others 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. One who refused to train there was Gene Tunney, because he complained about the place's sanitation, saying that he would never train there unless the windows were opened. Typical of him, Stillman refused to open the windows.
Stillman retired in 1959 after selling the building, and he joined his daughter in California. He liked painting, and became proficient painting in oils as he spent the last few years of his life at a nursing home in Santa Barbara. He passed away on August 19 of 1969.