Studying History and Philosophy at Harvard. [Fall 2001]

Parents: Claudine and Stephen Weiss (divorced in 1989). Is of German, Jewish and Portuguese ancestry.

Graduated from Chaminade College Preparatory High School in West Hills, California with honors [2000]

Grew up in Sacramento and Los Angeles, California

Visited Northwestern University, Evanston, Illinois, as a possible college to attend.

Pets: two cats named Simba and Samantha, one dog called McCormick

His stage name is derived from his real first name (Jonathan), his real middle name (Taylor), and his brother's middle name (Thomas).

Was the first actor to win the Lifetime Achievement Award at the Nickelodeon Kids' Choice Awards '99 (1999) (TV) for his memorable nine year role as "Randy Taylor" on "Home Improvement" (1991).

Loves to watch college basketball.

Doesn't like the nickname JTT. He doesn't understand why people just can't say his whole name.

Featured on the cover of The Advocate, a gay and lesbian magazine.

Ranked #25 in VH1's list of the "100 Greatest Kid Stars"

Has done voice overs for cartoons and video games such as "The Itsy Bitsy Spider" (1994), "The Adventures of Spot" (1987), The Ivy Cottage, and Scooter's Magic Castle.

Attended Harvard University.

Received 1996 NATO/ShoWest YoungStar of the Year Award [1996]

Has one brother, Joel Thomas Weiss.