Jayne Brook portrays Admiral Cornwell on Star Trek: Discovery. Born in Northbrook, Illinois, the actress boasts a career spanning more than three decades and counts among her numerous film and television credits Superman IV: The Quest for Peace, Don't Tell Mom The Babysitter's Dead, Gattaca, Chicago Hope, John Doe, Boston Legal, NCIS, Brothers & Sisters, Rizzoli & Isles and The Sweet Life.