Peter S. Greenberg was born to a Jewish family. Before his current CBS Radio Show, he served as a talk show host on 790 KABC in Los Angeles. Greenberg served as Vice-President of television development for Paramount, where he helped develop such shows as MacGyver. At MGM, he ran the creative team that developed thirtysomething for ABC. In 2012, Greenberg was inducted into the U.S. Travel Hall of Leaders, an award presented by the U.S. Travel Association.
