Kathleen Erin Walsh is an American actress and businesswoman. Her roles include Dr. Addison Montgomery on the ABC television dramas Grey's Anatomy and Private Practice, Rebecca Wright on the short-lived NBC sitcom Bad Judge, and Olivia Baker on the Netflix drama series 13 Reasons Why.Early lifeWalsh was born in San Jose, California, the daughter of Angela Walsh. She grew up in a Roman Catholic household in Tucson, Arizona. Her father is Irish, being a native of Navan, County Meath, and her mother is of Italian descent.Walsh attended Catalina Magnet High School for three years before transferring to and graduating from Rincon High School. She later studied acting at the University of Arizona and at Chicago's Piven Theatre Workshop before moving to New York City and joining the comedy troupe, Burn Manhattan, supporting herself by waitressing.CareerEarly careerBefore modeling, Walsh worked at Burger King and Dairy Queen.