Dr. Greenfield is the founder and medical director of The Center for Internet and Technology Addiction and former Assistant Clinical Professor of Psychiatry at the University of Connecticut School of Medicine where he taught Behavioral Addiction Medicine, Sexual Medicine, and supervised residents in psychiatry. Dr. Greenfield also served as Consulting Medical Director of The Greenfield Center @ Lifeskills, a residential treatment program for the treatment of video game and technology addictions. He is a leading authority on Internet and technology addiction and screen use, and is the author of numerous articles/book chapters and the book Virtual Addiction which in 1999 rang an early warning regarding the world’s growing Internet Addiction problem. Dr. Greenfield’s recent work is focused on the neurobiology of  Internet, Smartphone, and screen use and how to reduce our overuse of Internet screens. He is credited with popularizing the variable reinforcement (slot machine model) of behavioral addictions and the dopamine-behavioral addiction connection. Dr. Greenfield latest book, Overcoming Technology Addiction for Dummies was published in October 2021 by Wiley, and his recent TEDx talk “How to Manage your Technology so it doesn’t Manage you” was given in December of 2021.  

Dr. Greenfield participates with the national and international psychiatric and addiction medicine community by sharing his expertise through lectures, research, and popular presentations. He holds advanced training and board certifications in Addiction Medicine, Clinical Psychology, and Psychopharmacology.

Dr. Greenfield lectures throughout the world, and has appeared on TEDx Hartford, CNN, Dr. Oz. Good Morning America, The Today Show, Fox News, ESPN, NPR and HBO. He has been featured in U.S. News and World Report, Newsweek, People, Time, Washington Post, Wall Street Journal, and The Economist.