Trivia

Remained close to his former Lassie (1954) co-star June Lockhart until her death.

His original Timmy outfit is in the Smithsonian Institution next to the Fonz's leather jacket and Archie Bunker's chair.

Met and later married first wife Sandy after backing his car into her car by chance. They had a son and a daughter. They subsequently divorced.

In 1989, he worked in an episode of The New Lassie (1989) starring Wendy Cox, which reunited him with original Lassie (1954) co-star June Lockhart.

Revealed that he had a wonderful relationship with June Lockhart on Lassie (1954).

His father urged him to go to college. Jon attended Sonoma State University north of San Francisco. He initially sold real estate in the area.

Wrote a column for "Fido Friendly" magazine called Your Canine Connection.

Served on the Board of Directors for Canine Companions for Independence, a non-paid position he held for more than 25 years. Among his many awards was one presented by the Motion Picture Council for his dedication in helping the physically challenged.

His father was an aeronautical engineer; his mother accompanied him on the set and was paid a salary plus expenses for being with him. Brother Bill occasionally appeared in small roles on Lassie (1954).

In 1970, he departed from Hollywood, at 20 years old, after filming Disney's sci-fi comedy The Computer Wore Tennis Shoes (1969).

The youngest actor to ever star in a television series, seven-year-old Jon was hand-picked--he never tested for the role--by Lassie (1954) producer Bonita Granville on the strength of his work in Escapade in Japan (1957) at the age of six.

He was awarded a Star on the Hollywood Walk of Fame for Television at 7080 Hollywood Boulevard in Hollywood, California on February 1, 1994.