He served as one of the creators of the American sitcom television series Gimme a Break!, which he created with Mort Lachman.
[2] Rosen started his career in 1976, first writing a few episodes for the television series The Bob Newhart Show.
In 1987, he created the new NBC sitcom television series Roomies,[5] which ran for 8 episodes.
[6] In 2018, Rosen screenplayed the short film The Matchmaker, which starred Barbara Bain, Rhea Perlman, Robert Romanus and Bryna Weiss.
He explained that the short film was about a man who tries to find his mother a friend in her nursing home, which had also happened to Rosen.