Emeritus Staff, Senior Neurosurgeon, St. Vincents Medical Center, 2800 Main Street, Bridgeport, CT (Chief of Neurosurgery, 1985-2006);
Honorary Staff, Senior Neurosurgeon, Bridgeport Hospital, 167 Grant Street, Bridgeport, Connecticut;
Former Staff, Yale-New Haven Hospital and Yale Gamma Knife Center, New Haven, Connecticut.
Dr. Nijensohn is presently a neurosurgical consultant.
Honorary Professor: Department of Neurosurgery, Yale University School of Medicine, New Haven,