Created in the 1950s by the legendary Albert Ellis, rational emotive behavior therapy (REBT) is based on the idea that it is not external circumstances that make a person happy or unhappy, but rather internal thoughts about events or self. Therapy typically focuses on changing one's thinking, alongside the humanistic core REBT philosophies of unconditional acceptance of the self, others, and life itself. This second edition includes updated clinical research, as well as a thorough examination of the important distinctions between REBT and cognitive-behavior approaches.