Co-starred in Peter Bogdanovich's "Nickelodeon"
Had recurring role as a client-turned-love interest for Calsita Flockhart's "Ally McBeal"; earned an Emmy nomination
Had third teaming with Bogdanovich with the backstage comedy "Noises Off"
Had title role in the ABC half-hour comedy-drama "Hooperman"
Had title role in the NBC biopic "The Dreamer of Oz: The L. Frank Baum Story"
Headed the cast of the spin-off sitcom "Three's a Crowd" (ABC)
Received an Emmy nomination ten months after his death for Best Actor in a Comedy Series for his work on "8 Simple Rules for Dating My Teenage Daughter"
TV-movie debut in "The Night That Panicked America" (ABC)
Delivered strong dramatic performance as a Vietnam veteran who may be suffering from the effects of Agent Orange in the NBC TV-movie "Unnatural Causes"
Executive produced the short-lived sitcom, "Have Faith" (ABC)
Hosted the ABC variety special "John Ritter: Being of Sound Mind and Body"
Made Broadway debut co-starring with Henry Winkler in "The Dinner Party", a comedy written by Neil Simon
Made professional acting debut on stage at the Edinburgh Festival in Scotland
Starred in the ABC comedy series "8 Simple Rules"
Starred in the popular ABC sitcom, "Three's Company"
Executive produced the first season of the popular ABC sitcom, "Anything But Love"; also played recurring role on the series as Richard Lewis' nemesis
Film acting debut in "The Barefoot Executive"; billed ninth
Made TV debut as a guest in an episode of ABC's "Dan August", starring Burt Reynolds
Played Bob Chipeska, a department store manager in "Bad Santa"; movie released after his death
Starred in the CBS sitcom "Hearts Afire"; first screen collaboration with Billy Bob Thornton
Starred in the L.A. production of the play "J for J", writer-director Jenny Sullivan's autobiographical play about her developmentally disabled older brother
Voiced Clifford in the animated feature "Clifford the Big Red Dog"; movie released after his death
Co-starred in the ABC miniseries "Stephen King's 'IT'"
Delivered a change of pace performance as a gay man who befriends a co-worker in Billy Bob Thornton's "Sling Blade"
Formed Adam Productions
Had one of the leads in Bogdanovich's ill-fated "They All Laughed"
Had role of Reverend Fordwicke on the CBS drama "The Waltons"
Hosted the syndicated special "The Singing Cowboys Ride Again"
Played the surrogate father of the "Problem Child"
Reprised role in the sequel "Problem Child 2"