Marvin Ginsburg[1] (February 20, 1924 – March 25, 2005), known professionally as Greg Garrison, was an American producer and director in television.

While he was a 17-year-old student at Northwestern University, Garrison worked as a copy boy in a Chicago radio station's news department.

[citation needed] He also directed one of television's landmark 1960 presidential debates between John F. Kennedy and Richard Nixon.

[1] In his later years, Garrison supervised for Guthy-Renker the digital remastering of The Dean Martin Show and celebrity roasts for release on DVD.

The marketing of these included an entertaining infomercial with clips of an interview of Garrison by host Regis Philbin about his memories of producing/directing the Martin show.