Dennis Greenberger is a prominent psychologist known for his contributions to cognitive behavioral therapy (CBT). He co-developed the Cognitive Behavioral Therapy model, which focuses on changing negative thought patterns to improve emotional well-being. His work has significantly influenced the treatment of various mental health conditions, including anxiety and depression. In addition to his clinical practice, Greenberger has authored several influential books and resources on CBT. His most notable work, "Mind Over Mood," serves as a guide for both therapists and individuals seeking to understand and apply cognitive behavioral techniques in their daily lives.