Mathew W. Johnson, Ph.D. is an experimental psychologist conducting human research on psychedelics. From 2004-2024 he conducted seminal psychedelic research at Johns Hopkins, revitalizing psychedelic research. In March 2024 he joined Sheppard Pratt to expand his psychedelic research. He has published research on psychedelics in relation to mystical experience, personality change, tobacco smoking cessation, cancer distress treatment, depression treatment, and psychedelic risks/safety guidelines. In 2021 he received as principal investigator the first grant in about 50 years from the US government to administer a classic psychedelic for treatment, specifically psilocybin for tobacco addiction. He is also known for his expertise in behavioral economics, addiction, sexual risk behavior, and research with a variety of drug classes. He has been Interviewed by Anderson Cooper on 60 Minutes, New York Times, Washington Post, Wall Street Journal, CNN, NPR, Fox News, BBC, Michael Pollan, Lex Fridman Podcast, Huberman Lab Podcast, and Big Think.