In 1970, two years after receiving a doctorate in clinical psychology from the University of Michigan, I joined Samuel Yochelson, a psychiatrist and psychologist, in his Program for the Investigation of Criminal Behavior located in Washington, D.C., at St. Elizabeths Hospital. Dr. Yochelson already had been working for nine years to understand the mental makeup of offenders and to develop a program that would help the participants become responsible adults. Serving as clinical research psychologist, I collaborated with Dr. Yochelson in what turned out to be a seventeen-year research-treatment study of career criminals. On his first trip out of town to speak about his work, Dr. Yochelson collapsed in the St. Louis airport and later died on November 12, 1976, at a nearby hospital.