- His parents own and operate a dance studio in New York.
- Was cast as the son of Debra Winger in Shadowlands (1993) and as the son of Meryl Streep in The River Wild (1994).
- In 1994, he was nominated for a Saturn award and won a Young Artist award for his work in Jurassic Park.
- Appeared alongside his brother, John, in Simon Birch.
- In 2007, he wrote, directed, coproduced and starred in Matters of Life and Death.
- Joseph Mazzello Jr. — Father
- Mary Mazzello — Sister
- John Mazzello — Brother
- Ginny Mazzello — Mother
- University of Southern California, Los Angeles, CA
- Birth Name: Joseph Mazzello III
- Birth Place: Rhinebeck, NY
- Profession: Actor, Director
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