Sean Astin

Sean Patrick Astin (né Duke; born February 25, 1971) is an American actor and trade union leader who serves as the fourth national president of SAG-AFTRA. He began his career as a child actor, making his film debut as Mikey Walsh in The Goonies (1985), followed by significant roles as Billy Tepper in Toy Soldiers (1991), Dave Morgan in Encino Man (1992), Daniel Ruettiger in Rudy (1993), and Samwise Gamgee in The Lord of the Rings trilogy (2001–2003).

He is known to television audiences for portraying Lynn McGill on the fifth season of 24 (2006), the voice of Oso in Special Agent Oso (2009–2012), the voice of Raphael on Teenage Mutant Ninja Turtles (2012–2017), and Bob Newby on the second season of Stranger Things (2017).

Astin's acting awards include a Screen Actors Guild Award and two Young Artist Awards. He was also nominated for the Academy Award for Best Live Action Short Film in 1994 for the short film Kangaroo Court. Astin is the son of actress Patty Duke and was adopted in 1972 by her then-husband, actor John Astin.

Astin ran for president of SAG-AFTRA in 2025 and was elected for a two-year term. His term began in September 2025.