After searching nationwide for a new leader, Boston Medical Center tapped a high-ranking executive from Brigham and Women's Hospital to become its next president and chief executive. Kate Walsh, who has been executive vice president and chief operating officer at Brigham for the past five years, will take over at Boston Medical on March 1. She succeeds Elaine Ullian, who will step down Jan. 29 after running Boston Medical for 14 years.
