Dr. Garen Wintemute Shares New Research On Gun Violence Wednesday, November 14, 2018 | Sacramento, CA Listen / download audio Update RequiredTo play audio, update browser or Flash plugin. Dr. Garen Wintemute, an emergency room physician at the University of California, Davis, Medical Center, poses for a photo at the hospital in Sacramento, Calif., on Thursday, March 9, 2017.Rich Pedroncelli / AP Photo Deadly mass shootings like the recent killings in Thousand Oaks are preventable according to a UC Davis doctor who studies the topic. Dr. Garen Wintemute is an emergency room physician, professor and the Director of the Violence Prevention Research Program at UC Davis. His new research, titled “How to Stop Mass Shootings” and published in the New England Journal of Medicine, explores what might happen if two policies for selling and owning guns were properly enforced and how they could reduce future mass shooting incidents.