Dr. Felix Betzler is a board-certified psychiatrist and psychotherapist at Charité – Universitätsmedizin Berlin, where he also completed his medical training. He previously served as a Visiting Research Fellow at Harvard Medical School. At Charité, he heads the Research Lab for Recreational Drugs as well as the specialized ADHD Outpatient Clinic. In addition to his academic roles, he runs his own private practice and serves on multiple advisory boards for digital health solutions. He is actively involved in the development of certified digital health applications (DiGA) and is a member of the expert group on digital interventions for the German S3 guideline on ADHD.