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Albert Ellis was born on September 27, 1913. He was an American psychologist and psychotherapist who developed Rational Emotive Behavior Therapy (REBT), a form of cognitive-behavioral therapy that focuses on identifying and challenging irrational beliefs and behaviors. Ellis's work has had a significant impact on the field of psychology, and REBT is widely used today to treat a variety of mental health conditions, including anxiety, depression, and anger.