Children's Hospital Oakland CEO Frank Tiedemann has left the hospital, and longtime research director Bert Lubin, MD, was named as the interim leader. Hospital officials did not say what led to Tiedemann's departure. His tenure since joining Children's in early 2005, however, was marked by a failed bond issue and consistent rumors that the 2,600-employee, 200-doctor institution wanted to move out of Oakland. Lubin has been at Children's since 1971 and has been instrumental in building Children's Hospital Oakland Research Institute.