David Greenfield is a notable figure in the field of psychology, particularly known for his work on the impact of technology on mental health. He has conducted extensive research on how digital devices and social media influence human behavior and relationships. His insights have contributed to a better understanding of the psychological effects of technology in modern society. In addition to his research, David Greenfield is the founder of The Center for Internet and Technology Addiction, an organization dedicated to addressing issues related to internet addiction and promoting healthy technology use. Through his work, he aims to educate individuals and families about the potential risks associated with excessive screen time and to provide resources for those seeking help.