Department of Neurosurgery, The University of Texas, M.D. Anderson Cancer Center, Houston, Texas
Professor in Residence, Neurological Surgery, Halperin Endowed Chair, Neurosurgical Director, UCSF Gamma Knife Radiosurgery ProgramVice Chairman, Department of Neurological SurgeryRobert Ruth Halperin Chair, Meningioma Research, USCF, San Francisco, CA
Director, Skull Base Program, Lecturer, Harvard Medical SchoolDepartment of Neurosurgery, Brigham and Womens Hospital, Lecturer, Harvard School of Medicine, Boston, MA