Del (Wolf) Thiessen is Professor Emeritus at the University of Texas at Austin, where he studied animal and human reproductive and social behavior. He has published ten academic books and more than 250 research publications. He graduated from San Jose State College with a B.A. in psychology, and completed his Ph.D. in psychology at the University of California at Berkley. He researched alcohol preference among animals at Scripps Clinic and Research Foundation, later moving to the University of Texas. His interests are in evolution and behavior, reproductive and other social behaviors, abnormal behaviors, and the influence of the arts and music on scientific theories. His hobbies include billiards, writing novels and nonfiction books, magic, and raising animals on his ranch in Texas. He can be contacted through his website, www.darksideofthebrain.com.