Mallie J. Paschall, PhD is a Senior Research Scientist at the Prevention Research Center (PRC), Pacific Institute for Research and Evaluation, in Berkeley, California. Dr. Paschall received his doctorate in 1995 from the University of North Carolina – Chapel Hill School of Public Health. Dr. Paschall has 25 years of experience conducting research on the epidemiology, etiology, and prevention of substance use and violence among adolescents and young adults. Dr. Paschall has been involved in a number of NIH- and SAMHSA-sponsored studies on the etiology and prevention of heavy alcohol use among young adults, college students and adolescents, and he is currently the Associate Director of the Environmental Approaches to Prevention Center Grant funded by NIAAA. As part of the Center Grant, Dr. Paschall has directed multi-city studies in California to examine effects of local alcohol policies and enforcement on alcohol use among adolescents and young adults, and alcohol-related problems such as drinking and driving. Dr. Paschall has been a co-investigator for other community trials to evaluate environmental strategies to reduce alcohol use and misuse among college students in California and adolescents in Oregon. Dr. Paschall also directed 30-campus study on the effectiveness of AlcoholEdu for College, an online alcohol education and prevention course for college freshmen. Dr. Paschall is currently evaluating effects of recreational marijuana legalization and local retail availability of marijuana on cannabis use among adolescents in California and Oregon. Dr. Paschall is also involved in a randomized trial in Peru to evaluate effects of a Universal Prevention Training Curriculum to increase implementation of evidence-based interventions to improve school climate and reduce substance use among adolescents.