With a PhD in psychology, and a background in philosophy, Nathaniel Branden is a practicing psychotherapist and a corporate consultant, and is widely recognized as the world authority on self-esteem, a field he pioneered more than three decades ago. His many books include The Six Pillars of Self-Esteem, Taking Responsibility, Self-Esteem at Work, and A Woman's Self-Esteem. His newest book is My Years with Ayn Rand. He lives and works in Beverly Hills, California.