- Son of Patrick Duffy and Carlyn Rosser.
- Brother-in-law of Emily Cutler.
- Playwright and artistic director Sacred Fools Theatre Company.
- He played a character named Mark Harris in Charade (1990), One Last Kiss (1990) and Win Some, Lose Some (1991). This was the same name as his father Patrick Duffy's character in Man from Atlantis (1977).
- Older brother of Conor Duffy.
- Cousin of Barry Zito.
- Graduated Princeton University in 1996.
- He and his brother were both taught English by Elizabeth McGovern's mother.
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