Jayne Brook

Jayne Brook is an American actress who began in British regional theaters and London before moving to Los Angeles for television work. Born in Northbrook, Illinois, she studied at Oxford's New College and Duke University. In 1987 she made her film debut in Superman IV: The Quest for Peace, and she later appeared in the ITV comedy series The Old Boy Network. She is best known for her role as Dr. Diane Grad on Chicago Hope, a medical drama where she was a regular for five of six seasons, and for her role as Mary Ann Mitchell in The District between 2000 and 2002. Her other credits include Don't Tell Mom the Babysitter's Dead (1991), Bye Bye Love (1995), and a small part in Kindergarten Cop (1990). She also had roles on Sports Night, Boston Legal, Private Practice, and from 2017 to 2019 played Starfleet Vice Admiral Katrina Cornwell on Star Trek: Discovery.