Ronald Gabriel Palillo was an American actor and teacher. He was best known for his role as the endearingly dim-witted character Arnold Horshack on the ABC sitcom Welcome Back, Kotter (1975–1979).
Ron Palillo in 1975
Palillo as "Sweathog" Arnold Horshack on Welcome Back, Kotter, c. 1976
Welcome Back, Kotter is an American sitcom starring Gabe Kaplan as a high-school teacher in charge of a racially and ethnically diverse remedial education class called the "Sweathogs." Recorded in front of a live studio audience, the series aired on ABC from September 9, 1975, through May 17, 1979. It provided John Travolta with his breakthrough role.
The box set cover for the Warner Bros. Television Favorites DVD release of the series
The Sweathogs celebrate a winning lottery ticket as Mr. Kotter looks on.
The Cast