Chicago nightclub.

Brothers George Marienthal (1909-1972) and Oscar Marienthal (1913-1963) founded and managed three successful nightclubs in Chicago: Mister Kelly’s (1953-1975), The London House (1946-1975), and The Happy Medium (1960-late 1970s). London House, which was located in the London Guarantee Building, 85 E. Wacker Drive in Chicago's North Loop, was a destination for steak dinner and live jazz performances. Mister Kelly's opened on 1028 North Rush Street in Chicago's Gold Coast neighborhood in 1953, and featured both live jazz performances and stand-up comedy along with dinner menu. The Happy Medium, a stage space for sketch and improv comedy as well as musicals, opened in 1960 at 901 North Rush Street, just a block south of Mister Kelly's.

The clubs were notable for many reasons. One reason was their inclusivity in welcoming Black and white audiences, as well as hiring Black and white staff and booking Black and white entertainers, all of which was unusual in segregated Chicago. They were also notable because of the talent they hired; many comedians, musicians, actors, and other entertainers started in their early career years at one of these clubs and later became national and international stars. Examples include Ramsey Lewis, Lainie Kazan, Barbra Streisand, Jerry Stiller and Anne Meara, Richard Pryor, Dick Gregory, Bette Midler, Lily Tomlin, Della Reese, Bob Newhart, and Steve Martin.

David Marienthal, son of George and nephew of Oscar, began to collect photographs and other memorabilia about the clubs in the 2010s. in 2016, with the intent of making a documentary film, he also hired Adam Carston to research with him the history of the clubs and also conduct oral interivews with those involved in them. Their efforts resulted in over 100 audio and video interviews with key figures in the history, as well as a film entitled, "Live at Mister Kelly's" and released in 2021.