Allen Berger, PhD, is a leading expert in the science of recovery from addiction. Sober since 1971, Dr. Berger was part of a pioneering recovery program for marines returning from Vietnam with alcohol and other drug addictions—first as a participant, then as a counselor. Since then, he has become a thought leader in the field, working in clinical settings and private practice. In demand as a speaker, workshop presenter, and interviewee, Dr. Berger is well-known in recovery circles, among those in recovery as well as therapists and clinicians around the world. He has lectured and written extensively on the process of recovery, emotional sobriety, and the therapeutic value of the Twelve Steps.