在这些不同的影响下，埃利斯创造了理性的情绪行为疗法，认为人们的感觉是他们思维方式的结果。人们通常对自己，他人和世界抱有非理性的信念，这可能导致心理问题。 REBT通过改变那些非理性的信念和思维过程来帮助人们。 REBT是第一种认知行为疗法。 Ellis继续从事REBT的研究，直到他于2007年去世。由于他不断地调整和改进他的治疗方法，因此经历了许多名称更改。当Ellis在1950年代最初介绍他的技术时，他称之为理性疗法。到1959年，他已将名称更改为理性情绪疗法。然后，在1992年，他将名称更新为理性情绪行为疗法。 REBT非常重视理性和非理性。在这种情况下，非理性是任何不合逻辑或以某种方式阻碍个人实现其长期目标的东西。结果，理性没有固定的定义，而是取决于个人的目标以及将帮助他们实现这些目标的因素。
Under these different influences, Ellis created rational emotional behavioral therapy, thinking that people’s feelings are the result of their way of thinking. People often have irrational beliefs about themselves, others and the world, which can lead to psychological problems. REBT helps people by changing those irrational beliefs and thinking processes. REBT is the first cognitive behavioral therapy. Ellis continued to work on REBT until he died in 2007. He has undergone many name changes as he constantly adjusts and improves his treatment. When Ellis first introduced his technique in the 1950s, he called it rational therapy. By 1959, he had changed his name to rational emotional therapy. Then, in 1992, he updated his name to rational emotional behavior therapy. REBT attaches great importance to rationality and irrationality. In this case, irrationality is anything that is illogical or in some way hinders an individual from achieving his long-term goals. As a result, reason has no fixed definition, but rather depends on individual goals and the factors that will help them achieve them.