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.

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Trivia

His parents own and operate a dance studio
Radio Flyer (1992) began filming on Joe's 7th birthday.
In the original 1990 novel of Jurassic Park, Tim was age 11 and Lex was age 8. Steven Spielberg swapped their ages in Jurassic Park (1993) so that Joseph could play Tim.
Brother of John Mazzello, also has an older sister, Mary.
Joseph was originally going to play Jack Banning, Robin Williams' son in Hook (1991), but he was too young for the part. Steven Spielberg went out of his way to the point of changing the script for Jurassic Park (1993) so that Joseph could play Tim.
Raised in Hyde Park, New York.
Favorite movie is It's a Wonderful Life (1946).
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 A.I. Artificial Intelligence (2001).
Favorite actor is his idol, James Stewart.
His hometown of Hyde Park, NY is where Franklin D. Roosevelt used to live.
Has been passionate about oldies music, and when he was growing up, his sister teased him for being old-fashioned.
Graduated from USC with a degree in cinema-television (2005)
When work began on A.I. Artificial Intelligence (2001) in 1993, he was cast as David.
Was considered one of the 55 faces of the future by Nylon Magazine's Young Hollywood Issue.
Attended Our Lady of Lourdes High School in Poughkeepsie, NY.
His father is of three quarters Italian, and one quarter German Jewish, descent. His mother is of Irish, and small amounts of English and Dutch, ancestry.
A student at the University of Southern California (USC), as a Cinema-Television major [May 2002].
He played Richard Attenborough's grandson in Jurassic Park (1993). Attenborough later cast him as Douglas Gresham in Shadowlands (1993), his next film as a director.
Born on the same date as Maggie Grace.

Make acting seem real and as if it weren't acting. Just make it real.
You guys are getting exponentially weirder.