Jayne Brook is an American actress. She had her career beginnings in the ’80s, debuting in the 1987 film Superman IV: The Quest for Peace. In the 1990s, she had performances in the films Kindergarten Cop, Don’t Tell Mom the Babysitter’s Dead, Clean Slate, Bye Bye Love, Ed, Last Dance, Gattaca, and Into My Heart. On television, she starred as Ann Hudson WIOU and Beverly Halleran on L.A. Law. She became widely known for starring as Dr. Diane Grad on Chicago Hope. Afterward, she played Abby Jacobs on Sports Night. In the 2000s, she became known for her roles as Mary Ann Mitchell on The District and Jamie Avery on John Doe. She currently plays Adm. Katrina Cornwell on Star Trek: Discovery.