Rational Emotive Behavior TherapyCreated in the 1950s by the legendary Albert Ellis, rational emotive behavior therapy (REBT) teaches clients to challenge their irrational thinking. REBT is based on the simple idea that it is not external circumstances that make a person happy or unhappy, but rather internal thoughts about events or oneself. Thinking, feeling, and behavior are seen as linked and influencing one another. Because changing one's thinking is usually the simplest tactic