Scott Baio
Scott Vincent James Baio (/ˈbeɪ.oʊ/; born September 22, 1960 ) is an American actor and television director, best known for his roles as Chachi Arcola on the sitcom Happy Days and its spin-off Joanie Loves Chachi, the titular character on the sitcom Charles in Charge and the main character in the musical Bugsy Malone. He is also known for his role as Dr. Jack Stewart in the medical-mystery-drama series Diagnosis: Murder. Baio has also appeared in various television programs as a guest star, several independent films, and currently stars on the Nick at Nite sitcom See Dad Run.