George E. Vaillant, MD, is a psychoanalyst and a research psychiatrist, one of the pioneers in the study of adult development. He is a professor at Harvard University and directed Harvard's Study of Adult Development for thirty-five years. He is the author of Aging Well, Triumphs of Experience, and The Natural History of Alcoholism, and his 1977 book, Adaptation to Life, is a classic text in the study of adult development. He lives in Orange, California, but works part time at Massachusetts General Hospital. Don Hagen has been behind the microphone since fifth grade. He is a nine-time winner of the Peer Award for narration/voice-over and twice winner of an AudioFile Earphones Award. He has also been heard in radio and television commercials and documentaries. In addition to his freelance voice work, he is a member of the audiobook narration team at the Library of Congress.