Jayne Brook (born September 16, 1960) is an American actress, best known for her roles as Dr. Diane Grad on the medical drama Chicago Hope, as a series regular for five of the show's six seasons, and Mary Ann Mitchell on The District from 2000 to 2002. Between 2017 and 2019, Brook had a recurring role as Starfleet Vice Admiral Katrina Cornwell in the series Star Trek: Discovery.
Jayne Brook's screen work to date leans strongly toward Drama and Comedy, a consistent thread across her credits so far.
Jayne Brook's most notable role to date came in Gattaca (1997), where she played Marie Freeman. She also appeared in Kindergarten Cop (1990) as Zach's Mother. Most recently appeared in Star Trek: Discovery (2017) as Admiral Katrina Cornwell.
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