From left, Ahmed Helal, M.B.B.Ch., pediatric neurosurgery fellow, and Brannan O'Neill, M.D., fourth-year neurosurgery resident, confer with Nathan Selden, M.D., Ph.D., professor and chair of neurosurgery, OHSU School of Medicine. Selden and OHSU neurosurgery faculty members are playing leadership roles nationally in improving residency training in their field. (OHSU)
