David P. Barash, Ph.D., is an evolutionary biologist and professor of psychology at the University of Washington. He has written 34 books covering evolution, animal and human behavior, and peace studies. He is a Fellow of the American Association for the Advancement of Science. He is married to psychiatrist and frequent co-author Judith Eve Lipton. He was named as one of the "101 most dangerous professors" in the U.S. by conservatives.
Dr. Lipton retired from the practice of psychiatry in 2009 after 30 years in order to move to Costa Rica to explore its culture and people. She is writing a book about the phenomenon of happiness in Costa Rica, noted to be the happiest country in the world on 3 different international surveys.