At 20 years old, Jon left Hollywood in 1970 after filming Disney's The Computer Wore Tennis Shoes (1969).
Daughter, Katie (11 January 1986).
Got a star on the Hollywood Walk of Fame 1994.
Jon serves on the Board of Directors for "Canine Companions for Independence", a non-paid position he's held for more than 20 years. Among his many awards, he was presented one by the Motion Picture Council for his dedication in helping the physically challenged.
Jon's father urged him to go away to college. Jon attended Sonoma State University north of San Francisco. He initially sold real estate in the area.
Jon's father was an aeronautical engineer; his mother accompanied Jon on the set and was paid a salary plus expenses for being with him. Brother Bill occasionally appeared in small roles on "Lassie" (1954).
Met and later married first wife Sandy after accidentally backing his car into hers. They had a son and a daughter. They subsequently divorced.
Original Timmy outfit is in the Smithsonian next to the Fonz's leather jacket and Archie Bunker's chair.
Son, Ryan (26 January 1984).
The youngest actor to ever star in a TV show, seven-year-old Jon was hand-picked by "Lassie" (1954) producer Bonita Granville solely on the strength of his work in the film So Big (1953) at the age of 3. Jon never tested for the role.
Writes a column for Fido Friendly magazine called Your Canine Connection.