The author of Reality Therapy and Take Effective Control of Your Life shows readers how to gain strength and self-esteem through positive behavior. The author of Reality Therapy and Take Effective Control of Your Life shows readers how to gain strength and self-esteem through positive behavior. William Glasser, M.D., is a world-renowned psychiatrist who lectures widely. His numerous books have sold 1.7 million copies, and he has trained thousands of counselors in his Choice Theory and Reality Therapy approaches. He is also the president of the William Glasser Institute in Los Angeles.