Helen Fisher, Ph.D. Helen Fisher, PhD, is a research professor and member of the Center for Human Evolutionary Studies in the department of anthropology at Rutgers University. Her books include Why Him? Why Her? How to Find and Keep Lasting Love, Why We Love: The Nature and Chemistry of Romantic Love, and Anatomy of Love: The Natural History of Mating, Marriage and Why We Stray. She is also a columnist for O, The Oprah Magazine.