- Married to Cleveland, Ohio, politician Tim Hagan. They were introduced to one another by her mother.
- Children: Two sons - Ian Thomas (born 1983) and Alexander James (born 1984); one daughter.
- For the Star Trek Thirtieth Anniversary Special, she performed a parody sketch of "Star Trek: Voyager" (1995) with "Frasier" (1993) stars David Hyde Pierce, John Mahoney, Jane Leeves, and Peri Gilpin
- Was a friend of the late John Kennedy Jr. and attended his funeral with husband Timothy Hagan.
- Was initially turned down for the role of Capt. Janeway on "Star Trek: Voyager" (1995), in favour of Geneviève Bujold. When Bujold backed out of the project two days into shooting, Mulgrew again auditioned for the role, and won it!
- Husband Tim Hagan ran as the Democratic Candidate for Governor of Ohio in 2002, but lost the 5 November 2002 election.
- When cast for the role of Capt. Janeway, Mulgrew asked that the character's first name be changed from Nicole to Kathryn. The producers agreed.
- The John R. Maxim novel "Abel Baker Charlie" has a character with her name.
- Her character on "Star Trek: Voyager" (1995), Captain Kathryn Janeway, is regarded by fans as having Bipolar disorder because of her erratic actions. Ms. Mulgrew said she blames the writers.
- Kathryn Janeway's character was based on a feminist writer Elizabeth Janeway.
- Husband Tim Hagan proposed to her on the set of "Star Trek: Voyager" (1995).
- Owns/owned a chocolate colored labrador called Gracie.
- Parents: Joan Virginia and Thomas James Mulgrew
- Has a home in Brentwood, California.
- Has a brother called Joe.
- She is good friends with fellow "Star Trek" alumnus John de Lancie ("Q").
- Siblings: Tom, Joe, Jenny, Laura, Sam
- Opposes abortion.
- Has appeared with Jonathan Frakes in four different productions: Camp Nowhere (1994), "Gargoyles" (1994), "Star Trek: Voyager" (1995) and Star Trek: Nemesis (2002).
- An avid fighter against Alzheimer's disease.
- In 2003 received a Lucille Lortel nomination for Outstanding Lead Actress for Tea at Five
- In 2003 received an Outer Critics Circle nomination for Outstanding Solo Performance in Tea at Five.
- In 2003 received Broadway.com's Audience Award for Favorite Solo Performance in Tea at Five.
- Won the award for Best Actress at the 29th annual Carbonell Awards for her portrayal of Katharine Hepburn in 'Tea at Five'.
- She won the Tracey Humanitarian Award for her performance as driven alcoholic news anchor Hillary Wheaton on a 1992 episode of "Murphy Brown" (1988) entitled "On the Rocks".
- Received an Honorary Doctorate of Letters for Artistic Contribution from Seton Hill University in Greensburg, Pennsylvania.
- In 1996, was contracted by IBM to help promote the latest release of OS/2 Warp, version 4 (previously codenamed Merlin), due to associations with Star Trek.
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