James O. Prochaska, PhD, is Professor of Psychology and Director of the Cancer Prevention Research Consortium at the University of Rhode Island, where he co-developed the transtheoretical /stages of change model. Dr. Prochaska has over 50 years of psychotherapy experience in a variety of settings and is the first psychologist to win a Medal of Honor for Clinical Research from the American Cancer Society. His books include Changing for Good and Changing to Thrive.

John C. Norcross, PhD, ABPP, is Distinguished Professor of Psychology at the University of Scranton, Adjunct Professor of Psychiatry at SUNY Upstate Medical University, and a clinical psychologist in independent practice. Among his books are Psychotherapy Relationships That Work, Handbook of Psychotherapy Integration, and Insider's Guide to Graduate School in Clinical and Counseling Psychology.

"Systems of Psychotherapy is a brilliant book and indispensable guide for both experienced and new clinicians. Each edition gets better at capturing fundamental principles of change at the interface of individual experience and its social contexts, including the therapeutic relationship." --Ester R. Shapiro, Ph.D., University of Massachusetts

"Systems of Psychotherapy is a special book that has a special place among theory books in psychotherapy. Most such books are duly informative, but the Prochaska and Norcross text is in a league of its own in terms of its ability to both inform and engage the reader in the material." --Charles J. Gelso, Ph.D., University of Maryland

"In the confusing multiplicity of psychotherapeutic orientations, there is nothing better, more revealing, or more entertaining than letting orientations point out their differences with each other. That is the strategy that Prochaska and Norcross perfectand that is why I use their book in my psychotherapy courses with psychiatrists and psychologists throughout Europe." --Ferdinand Knobloch, M.D., University of British Columbia

"Systems of Psychotherapy provides state of the art information about counseling/therapy theories in a highly engaging manner. It is not just a superb text; it is the standard to which other texts should aspire." --Glenn E. Good, Ph.D., University of Missouri-Columbia

"In my many years of clinical training, Systems of Psychotherapy is the only text I have known to reach such singular comprehensiveness and usefulness in helping students learn the theoretical foundations of psychotherapy. Norcross and Prochaska go beyond conventional descriptions of theories to present integrative perspectives, therapeutic commonalities, outcome research, and future directions. A superb and practical text!" --Linda F. Campbell, Ph.D., University of Georgia

"Simply the best book on approaches to psychotherapy. An excellent overview of all of the major approaches with objective presentation of each theory." --Mark Aoyagi, Ph.D., University of Denver