High Quality Content by WIKIPEDIA articles! Aaron Temkin Beck (born July 18, 1921) is an American psychiatrist and a professor emeritus in the department of psychiatry at the University of Pennsylvania. He is widely regarded as the father of cognitive therapy, and his pioneering theories are widely used in the treatment of clinical depression. Beck also developed self-report measures of depression and anxiety including Beck Depression Inventory (BDI),Beck Hopelessness Scale, Beck Scale for Suicidal Ideation (BSS), Beck Anxiety Inventory (BAI), and Beck Youth Inventories. He is the President Emeritus of the Beck Institute for Cognitive Behavior Therapy and the Honorary President of the Academy of Cognitive Therapy, which certifies qualified cognitive therapists.