JTT (as he's known to his throngs of teenage fans) plays Randy, the glib middle son on "Home Improvement." Born in Bethlehem, Pa., Jonathan has been working in show business since he was 5. In addition to his TV work, Jonathan has appeared in feature films, including Man of the House, Pinnochio, The Lion King (voice of Simba) and Tom Sawyer. Jonathan has also made guest appearances on "Smallville" and as the voice of Tyler Tucker on "The Wild Thornberrys."