Jim's father is Charles Frederick.
Jim wrote the following feature films: Tooth Fairy, Russell, The Man, Tom, Dick, and Harry, A Different Loyalty, Inside Story, One Good Turn, Smart, Bad to the Bone, Traces of Red, and Good Times, Bad Times.
Jim is a keen follower of the Oakland A's baseball team.
Jim married writer Margaret Oberman in 1991, but divorced her in 2004. Together, they had a daughter named Alexandra who was born in 1994.
In the early 1980s, Jim dated and lived with Linda Kozlowski (Crocodile Dundee) in New York.
Jim turned down the request to appear in a French magazine's "Sexiest Man of the Year?" article.
Jim was on the soccer team at London University.
In 1980, Jim directed 3 plays in repertory, becoming the youngest director working in the English theatre at the time.
Jim starred in several TV movies and mini series such as From Earth to the Moon, A Mom for Christmas, She Creature, and The Women of Windsor.
Jim won the Bay Area Critics' Best Actor Award for his performance in The Boy's Own Story.
Jim made his theatrical debut in the United States in The Boy's Own Story, a show about a soccer goalkeeper, at the Julian Theatre in San Francisco.
Jim believe his role as Prince Charles in the CBS mini-series The Women of Windsor was his most comedic performance.
Jim has appeared in the following Broadway shows: Noises Off, Present Laughter, The Knack, Make and Break, Design for Living, The Boy's Own Story, Diary of a Hunger Strike, Beyond the Fringe, The Importance of Being Earnest, The Caretaker, and How the Other Half Loves.
Jim acts, writes, and produces plays and movies for the UK and US.
Jim studied English literature at London University.
Jim attended a Benedictine Catholic boarding school called Worth Abbey in the south of England.
Jim's mother, Celia May O'Callaghan, is of Irish decent.
Jim's grandfather, Harry Piddock, was in a play with Charlie and Syd Chapman before Charlie came to America.
Jim Piddock does the voice of Major Zero in the Playstation 2 game Metal Gear Solid 3: Snake Eater. He also voices characters in The Bard's Tale, Return to Castle Wolfenstein: Tides of War, The Lord of the Rings: The Fellowship of the Ring, and Disney's The Lion King: Simba's Mighty Adventure.