Born in Rhinebeck, New York, he got into acting when he was 5 years old, after his sister had appeared in 30-odd commercials. Since then he has acted opposite some of the best actors in Hollywood as a bright, expressive actor with complexity, sensitivity, and emotion. He attended film school at USC and got a degree in cinema and television production. He plans on continuing his acting career while also following his aspirations of becoming a director.

1. G.I. Joe: Retaliation (G.I. Joe: Retaliation) (2012) - Mouse

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2. The Social Network (2010) - Dustin Moskovitz

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3. "The Pacific" (2010) - PFC Eugene Sledge / ... (10 episodes, 2010) 4. The Hollow (2004) - Scott 5. Wooly Boys (2001) - Charles 6. Beyond Jurassic Park (2001) - Himself 7. Simon Birch (1998) - Joe Wenteworth 8. Star Kid (1997) - Spencer Griffith 9. The Lost World: Jurassic Park (1997) - Tim Murphy 10. A Father for Charlie (1995) - Charlie 11. The Making of 'Jurassic Park' (1995) - Himself 12. Shadowlands (1993) - Douglas Gresham 13. Jurassic Park (1993) - Tim Murphy 14. Desperate Choices: To Save My Child (1992) - Willy Robbins (as Joe Mazzello) 15. Radio Flyer (1992) - Bobby

1. His parents own and operate a dance studio

2. Radio Flyer (1992) began filming on Joe's 7th birthday.

3. Steven Spielberg swapped the ages of the children in Jurassic Park (1993) so Joe could play Tim

4. Brother of John Mazzello, also has an older sister, Mary.

5. He was originally going to play Jack, Robin Williams' son in Hook (1991), but he was too small, so Steven Spielberg went out of his way to the point of changing the script for Jurassic Park (1993), to let him play Tim.

6. Raised in Hyde Park, New York.

7. Favorite movie is It's a Wonderful Life (1946).

8. Was put under a contract in 1993 for Wartime Lies, a screenplay based on the novel by Louis Begley, under direction of the late Stanley Kubrick. He was on the contract for two years. The movie was never made. It did however, lead to rumors of him being in Artificial Intelligence: AI (2001).

9. Favorite actor is his idol, James Stewart.

10. His hometown of Hyde Park, NY is where Franklin Delano Roosevelt used to live.

11. Has been passionate about oldies music, and when he was growing up, his sister teased him for being old-fashioned.

12. Graduated from USC with a degree in cinema-television (2005)

13. When work began on Artificial Intelligence: AI (2001) in 1993, he was cast as David.

14. Was considered one of the 55 faces of the future by Nylon Magazine's Young Hollywood Issue.

15. Attended Our Lady of Lourdes High School in Poughkeepsie, NY.