Jeffrey made his first appearance on the TV series Barney Miller in the episode “Snow Job”. In Jaws, he played Deputy Hendricks, and he reprised the role in the sequel Jaws 2 in 1978; in 1976, he guest-starred in Baretta. He appeared in the Joe Dante cult classic Hollywood Boulevard. He appeared in the horror film Halloween II playing Graham, a dentist who examines dead Ben Tramer’s body, believing him to be Michael Myers. He made an appearance on Happy Days in two episodes: The People vs. the Fonz and Fonzie the Flatfoot. He worked on the 1989 film The ‘Burbs and has produced many independent projects.