Joyce Davidson, with whom Susskind was in a relationship, began working as a co-producer of a television talk show Susskind hosted locally in New York called Hot Line in June 1964. It was a different show from the Open End talk show. Hot Line was the first television show to use the recently invented ten-second broadcast delay. This gave the control room time to delete material deemed unfit for broadcast, especially from telephone call-ins. Davidson had a hand in the on-air version of the show and among other duties screened viewer phone calls. She also made the first approach to some of the people who appeared as guests on Hot Line, including Malcolm X, whom she invited for Hot Line immediately after he gave a speech at The Town Hall.
Susskind was also a noted producer, with scores of movies, plays, and TV programs to his credit. His legacy is that of a producer of intelligent material at a time when TV had left its golden years behind and had firmly planted its feet in programming which had wide appeal, whether or not it was worth watching. Among other projects, he produced television adaptations of Beyond This Place (1957), The Bridge of San Luis Rey (1958), The Moon and Sixpence (1960), Ages of Man (1966), Death of a Salesman (also 1966), Look Homeward, Angel (1972), The Glass Menagerie (1973), and Caesar and Cleopatra (1976); the television films Truman at Potsdam (1976), Eleanor and Franklin (1976), and Eleanor and Franklin: The White House Years (1977); and the feature films A Raisin in the Sun (1961), Loving Couples (1980). In 1964, he produced Craig Stevens's acclaimed CBS drama Mr. Broadway, which left the air after thirteen episodes. He also produced and owned all the rights to the 1961 fourteen-episode macabre CBS TV series – Way Out. His production company, Talent Associates, also produced Get Smart.