ABSTRACT. The case for rational emotive behavior therapy (REBT) and cognitive behavior therapy (CBT) with offenders is reviewed. Philosophical and practical problems in conducting REBT assessment and treatment with this population are identified. Suggestions regarding offender treatment address goals and content of therapy, the therapeutic relationship, overcoming client resistance, and self-care for the practitioner. Therapists of offenders are encouraged to apply REBT to themselves to increase effectiveness and reduce risk. In this regard, clinicians are offered suggestions regarding accepting the offender, maintaining a goal-oriented focus, and taking responsibility for the quality but not the outcome of their work.For several reasons, cognitive therapies may be effective with a wide range of offender groups. Erroneous assumptions and faulty cognitive processes can result in antisocial behavior (Freeman, Pretzer, Fleming, & Simon, 1990) and eventual imprisonment. Comprehensive REBT may be useful in combating irrational beliefs and associated dysfunctional emotional states that give rise to offending. Indeed Ellis (1985a) recommends changing the "basic thinking" of the offender in the direction of diminishing absolutistic thinking, increasing long range hedonism, and increasing self-acceptance. In addition, offender work is likely to elicit irrational beliefs held by therapists, leading them to react to clients with fear, pity, or contempt. Such reactions can Irwin F. Altrows is a psychologist at Kingston Psychiatric Hospital and in private practice. He is an Associate Fellow and Training Faculty Member of the Institute for Rational-Emotive Therapy.