Christopher Morrison, PhD, is a researcher and Assistant Professor of Epidemiology at the Columbia University Mailman School of Public Health. His research seeks to understand how social and physical environmental conditions affect population health, particularly injuries, alcohol use, and alcohol-related harms. His recent work has examined the impacts of ridesharing services (such as Uber and Lyft) on motor vehicle crashes, firearm laws on firearm violence, and retail alcohol availability on alcohol consumption. In addition to his research, Dr. Morrison teaches Spatial Epidemiology for masters and doctoral-level students, and serves as Training Coordinator for the Substance Abuse Epidemiology Training Program in the Department of Epidemiology. Prior to his time at Colombia, he worked as an Associate Research Scientist at the Prevention Research Center of the Pacific Institute for Research and Evaluation in Berkeley, California. He completed a postdoctoral fellowship in the Penn Injury Science Center at the University of Pennsylvania and holds a Ph.D. in epidemiology from Monash University, Australia.