Matthew W. Johnson, Ph.D., Associate Professor at Johns Hopkins, is an expert on psychedelics, other drugs, and addiction. He has conducted research in behavioral pharmacology for >20 years and with psychedelics for >15 years. Matt published psychedelic risk and safety guidelines in 2008, helping to resurrect human psychedelic research. He published the first research on psychedelic treatment of tobacco addiction in 2014, and the largest study of psilocybin in treating cancer distress in 2016. His 2018 review of psilocybin abuse liability recommended placement in Schedule-IV upon potential medical approval. He has personally guided >100 psychedelic sessions. Matt also conducts behavioral economic research on drug use, addiction, and sexual risk. He conducted seminal research indicating delay discounting, or the devaluation of future consequences, is a fundamental behavioral process underlying addiction. He has applied other economic concepts, such as demand analysis, to understand drug use and other risk behavior, including current research informing the FDA on tobacco regulation. Matt published the first study in humans finding that administering cocaine increases sexual desire and sexual risk, providing a critical link between cocaine use and HIV/STI risk. He has published studies on nearly all psychoactive drugs classes, and is the 2019 President of the Psychopharmacology and Substance Abuse Division of the American Psychological Association. He is also President-Elect of the International Society for Research on Psychedelics, playing a lead role in founding this organization. Matt has been interviewed widely about drugs, addiction, and risk behavior, including by the New York Times, Washington Post, Wall Street Journal, BBC, 60 Minutes, CNN, Fox Business News, NPR, CBS News, and NBC News. Matt and his research were featured in an episode of Breakthrough on the National Geographic Channel, produced by Ron Howard, and in Michael Pollan's best-selling book, How to Change Your Mind: What the New Science of Psychedelics Teaches Us About Consciousness, Dying, Addiction, Depression, and Transcendence.