- Originally aspired to be a baseball player while growing up, but had to stop after his arm was injured during a game.
- Following college, lived with his grandmother in Paris while working as a bartender.
- Performed in stage productions of Johnny on a Spot, Misha's Party and Dead End at Williamstown Theatre Festival in 1997.
- Played the role of Young Man in an off-Broadway production of Snakebit in 1998.
- In 2000, changed his surname from Rubinstein to Weston because there was already a Michael Rubinstein in the Screen Actors Guild.
- Performed the role of Daniel Reed in Kenneth Lonergan's The Waverly Gallery at Pasadena Playhouse in 2002.
- In 2010, performed in the off-Broadway production Extinction opposite James Roday.
- Is a longtime friend of Zach Braff, who has cast him in several of his projects, including Garden State and The Last Kiss.
- John Rubinstein — Father
- Artur Rubinstein — Grandfather
- Jessica — Sister
- Jacob Rubinstein — Half Brother
- Priscilla Ahn — Wife
- Max Rubinstein — Half Brother
- Judi West — Mother
- Peter Rubinstein — Half Brother
- Northwestern University, Evanston, Illinois, United States (BA in Theatre, 1995)
- Birth Name: Michael Rubinstein
- Birth Place: New York, New York, United States
- Profession: Actor
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