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Rational-Emotive Therapy (RET) was developed by Albert Ellis in the 1950s. This approach is a form of cognitive-behavioral therapy that focuses on identifying and changing irrational beliefs that lead to emotional and behavioral issues. Ellis posited that people often create their own emotional disturbances through the way they interpret events. By focusing on these interpretations, RET aims to help clients shift their perspectives to more rational and constructive ones.

Ellis’s work has been foundational in the field of psychology, particularly in cognitive-behavioral approaches, which emphasize the role of thinking in emotional health. His ABC model (Activating event, Belief, Consequence) is a cornerstone of Rational-Emotive Therapy, illustrating how beliefs influence emotional responses.

The other individuals listed have significant contributions to psychology but are associated with different theories. Sigmund Freud is known for psychoanalysis, Carl Rogers for client-centered therapy, and William Glasser for reality therapy. Each of these approaches has a distinct focus and methodology that differs from the principles laid out in Ellis's Rational-Emotive Therapy.