- Once substituted for her sister as Claire Kincaid on Law & Order (1990) when Jill was out of town filming an "L&O" crossover episode for Homicide: Life on the Street (1993). The two are so identical, viewers didn't notice the switch.
- Twin sister of Jill Hennessy
- Used to perform, with her twin sister Jill Hennessy, in an act named (what else?) 'Jack and Jill".
- She and Jill played twin sisters in Dead Ringers (1988).
- Is currently a journalist and writer in Canada.
- Has a Master of Arts degree in French Literature.
- Her mother, Maxine, is a secretary in Montreal and a fantastic cook. Her father, John Paul Sr., is a meat salesman and a sales & marketing executive in Canada. She has a twin sister, Jill Hennessy, who is an actress, and a younger brother, John Paul Jr.
- Her grandmother, Eleanor Hennessy, was a huge influence in her early life.
- She and husband Terry Moore welcomed the arrival of their first child, Mia Katherine Hennessy Moore, she weighed 8 pounds 11 ounces [5 February 2004]
- Writes articles for Canadian magazines.
- Sister-in-law of Paolo Mastropietro.
- Mother of two girls.
- Host of "Medical Intelligence" seen on Canadian television stations Rogers Television, Tech TV and MSNBC (March 2003)
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