Dr. Del Wolf Thiessen is Professor Emeritus of Evolutionary Psychology at the University of Texas in Austin. He studied at Denver University, received his B.A. in Psychology from San Jose State College (now San Jose State University), and received his Ph.D. in Psychology from the University of California at Berkeley. Dr. Thiessen conducted research on the genetics of alcoholism in the Department of Psychiatry at Scripps Clinic and Research Foundation in La Jolla, California. He is Fellow of the American Psychological Association and Fellow of the American Association for the Advancement of Science and Member Who’s Who in America. At the University of Texas he was granted the Young Scientist Career Development Award from the National Institutes of Mental Health and later served eight years on the NIMH’s Psychology Section evaluating grant applications for scientific research. His research was funded primarily by NIMH for 20 years, during which time he published 9 academic books and over 250 research articles. At UT Austin he taught graduate and undergraduate courses in Comparative Psychology, the Evolution of Human Behavior, the Psychology of Sex, and Evolutionary Psychology and investigated animal communication and human biology and behavior. He retired from the Department of Psychology at the University of Texas at Austin as Professor Emeritus. Thiessen continues his investigations of human deviant behaviors, writing non-fiction and fiction, and publishing a weekly blog: www.darksideofthebrain.com. His first novel, The Devil’s Song, reached the 2011 semi-finals in competition at Amazon.com. Recent publications include Slip-Ups and the Dangerous Mind: Seeing Through and Living Beyond the Psychopath (Create Space: Amazon.com. 2012). Thiessen is writing a comprehensive analysis of human psychopathy, Psychopaths Rising: Unholy Links with Civilization and Destruction. Ranching is his favorite pastime, allowing him to play with and observe a wide mix of animals. His hobbies include reading history and literature, playing harmonica, and enjoying billiards.