Jack Rollins, a producer and a sharp-eyed talent manager who saw more than a shy gag-writer in Woody Allen and believed that the manic improvisations of Robin Williams would crack up audiences, died on Thursday at his home in Manhattan. He was 100.

His daughter Susan Rollins confirmed his death.

Mr. Rollins did not just boost fragile young egos. To his clients — who also included Billy Crystal, David Letterman, Lenny Bruce and the team of Mike Nichols and Elaine May, an American pantheon of hilarity — he was a father-confessor, real estate agent, psychiatrist, marriage counselor and financial guru.

Mr. Rollins and his longtime partner, Charles H. Joffe, who was a co-producer of most of Mr. Allen’s films in the 1970s, were deans of comedy management for decades starting in the 1960s, nurturing generations of the nation’s funniest entertainers to fill the hungry maws of nightclubs, television, Broadway and Hollywood.

Mr. Rollins was the model, loosely, for the manager of bizarre variety acts played by Mr. Allen in “Broadway Danny Rose” (1984). Like Danny Rose, he was a sympathetic listener, a friend and adviser who catered to the idiosyncrasies and professional needs of performers, although unlike Danny he never handled a blind xylophone player, a one-legged tap dancer or a performing penguin dressed as a rabbi. (Mr. Rollins appeared briefly in the film, playing himself.)