Dr. Aaron T. Beck, a groundbreaking psychotherapist regarded as the father of cognitive therapy, died Monday at his Philadelphia home. He had turned 100 in July.

Beck’s work revolutionized the diagnosis and treatment of depression and other psychological disorders. He died peacefully in his sleep, according to the Beck Institute for Cognitive Behavior Therapy, which he co-founded with his daughter, Dr. Judith Beck.

Beck developed the field of cognitive therapy, a clinical form of psychotherapy, at the University of Pennsylvania in the 1960s. It trains patients to identify and dismiss irrational negative thoughts about themselves, the world and the future.

Unlike Freudian psychoanalysis, which delves into a patient’s childhood and searches for hidden internal conflicts, cognitive therapy says turning around a self-disparaging inner monologue is key to alleviating many psychological problems, often in a dozen sessions or fewer.... Read More: Times of Israel