Scott Vincent James Baio (/ˈbeɪ.oʊ/; born September 22, 1960[a]) is an American actor. He is known for playing Chachi Arcola on the sitcom Happy Days (1977–1984) and its spin-off Joanie Loves Chachi (1982–1983), the title character on the sitcom Charles in Charge (1984–1990), Dr. Jack Stewart in the medical-mystery-drama series Diagnosis: Murder (1993–1995), and the titular role of the musical film Bugsy Malone (1976), his onscreen debut. Baio has guest-starred on various television programs, appeared in several independent films, and starred on the Nickelodeon sitcom See Dad Run (2012–2015).
Baio was born in the Bay Ridge neighborhood of the Brooklyn borough of New York City in 1960[a], the son of Italian immigrants Rose, a homemaker, and Mario Baio, who worked as his manager. He and his siblings were raised in Bensonhurst. He went to Xaverian High School.
In 1976, Baio played the title character Bugsy Malone in the children's gangster musical directed by Alan Parker, which also co-starred Jodie Foster. Baio and Foster later worked together again in the teen girl drama Foxes (1980), helmed by Adrian Lyne.

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