Actor known for his portrayal of Samwise Gamgee in the Lord of the Rings trilogy. He also played Mikey Walsh in The Goonies and played the titular character in Rudy. He also had a recurring role in season two of Stranger Things and starred in Netflix's No Good Nick.
He landed a role as a child in The Goonies and graduated from UCLA with a degree in history.
He served as a campaign manager to Dan Adler in California's thirty-sixth congressional district special election.
He was born to Patty Duke and John Astin. He got married to former Miss Indiana Teen USA winner Christine Harrell in 1992. The couple had three daughters together. In 2010, they made a movie together based on the novel Number the Stars.