when not active in acting and producing, kollmar operated a new york city supper club called the left bank, located at 309 west 50th street in manhattan. the 1965 obituary for his wife dorothy kilgallen in jet (magazine) said the left bank, which was no longer in business, had been ahead of its time with featuring african-american performers in a midtown manhattan setting. kollmar was also involved in the arts community, working with the art students league of new york and operating an art gallery in midtown manhattan.