Mister Kelly’s was a nightclub on Rush Street in Chicago which existed from 1953 to 1975. From around 1956 until its demise, it was a springboard to fame for many entertainers, especially jazz singers and comedians. As reported in the Chicago Tribune, "It was a supernova in the local and national nightlife firmament." Mister Kelly’s was owned and operated by brothers Oscar and George Marienthal, whose Chicago empire included the London House, an upscale jazz supper club, and the theatrically oriented Happy Medium.[1]