Haddon Klingberg, Jr., Ph.D. is a licensed clinical psychologist and professor of psychology, emeritus, North Park University, Chicago. He is the former president of Klingberg Family Centers in Connecticut and has taught and lectured in the USA and abroad. In 1962–63 he studied with Viktor Frankl, MD, Ph.D. at the Policlinic Hospital in Vienna. Many years later he interviewed Viktor and Elly Frankl extensively in their home and researched their stories, working in the capacity of their official biographer. The seven-year project resulted in a double-biography, When Life Calls Out to Us: The Love and Lifework of Viktor and Elly Frankl (Doubleday, 2001). Dr. Klingberg holds ordained ministerial standing in the United Church of Christ and is a member of the First Congregational Church of Wilmette.