Jason T. Siegel is a professor of psychology in Claremont Graduate University’s Division of Behavioral & Organizational Sciences. In addition to being the director of the Depression and Persuasion Research Lab, he is also the director of the Survey Design Lab and the Institute for Health Psychology & Prevention Science co-director.

Siegel’s research focuses on the social psychology of health behavior change. He utilizes persuasion, motivation, and emotion theories to develop approaches for maximizing the success of health campaigns and interventions. Accordingly, he has designed, implemented, and evaluated numerous efforts to increase various populations' health and well-being. Siegel’s most common areas of investigation include depression, organ donation, and substance abuse.

He was the 2014 recipient of the Western Psychological Association Early Career Research Award, was nominated for and accepted into the Society of Experimental Social Psychology in 2015, and was named the inaugural winner of the Claremont Graduate University Presidential Research Award for outstanding contributions to new knowledge in 2018. Dr. Siegel also received the 2019 Western Psychological Association Social Responsibility Award.

Siegel's research has been published in journals including Social Science and Medicine, Health Psychology, Clinical Psychological Science, and Journal of Applied Social Psychology. He has received funding from organizations such as the US Department of Health and Human Services, the National Institutes on Drug Abuse, the Bill and Melinda Gates Foundation, and the Department of Labor. Moreover, he has accepted invitations to give seminars on research methodology for organizations such as NBC/Universal, the Centers for Disease Control, and the American Evaluation Association.