Rollins co-wrote the song "Man Piaba" with Belafonte on his debut RCA Victor album Mark Twain and other Folk Favorites, released in 1954.

He went on to help shepherd the careers of several prominent comedians with his partner Charles H. Joffe, beginning in 1960 with Woody Allen and later with Dick Cavett, Billy Crystal, David Letterman, and Robin Williams.

[5] After the war, Douglas assisted Rollins in developing the professional contacts he needed to begin working as a producer on Broadway.

[6] He later became partners with Charles H. Joffe and they successfully managed the careers of several artists, most of whom were comedians, among them Woody Allen, Dick Cavett, Billy Crystal, Robert Klein, David Letterman, Robin Williams, and the comedy duo Nichols and May.

[4][8] In his 2005 Cecil B. DeMille Award acceptance speech, Robin Williams referred to Jack Rollins as 'the most ethical man in show business'.