- Son of actors Edmond O'Brien and Olga San Juan.
- Nephew of Liam O'Brien.
- Comedy writer for radio.
- Writer and producer of parody radio ads for gwbush.com and voteauction.com Collaborated with director Jon Dough on a "Figdish" music video for A&M records.
- Younger brother of Maria O'Brien and Bridget O'Brien Adelman.
- Ex-brother-in-law of Michael Anderson Jr..
- Sang and played guitar in pubs with Glenn Cornick, Jethro Tull's bassist. Opened for The Ventures and Dick Dale.
- Watched his father work as an actor at the studios and on location. Celebrated his 6th birthday in Mexico with cast members of The Wild Bunch (1969).
- Director Bernard L. Kowalski put him in a shot, with his dad, in the first episode of The Streets of San Francisco (1972), The Thirty-Year Pin (1972).
- Called "Poison Pen" by his high school principal for writing a column satirizing faculty meetings.
- Brother-in-law of Barry Adelman.
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