Clay Routledge, Ph.D., is a social psychologist and professor of psychology at North Dakota State University. His research focuses on how the need to perceive life as meaningful impacts mental and physical health, close relationships, and intergroup relations. Dr. Routledge is a leading expert in the area of experimental existential psychology. He regularly publishes his work in the top psychology journals, recently co-edited a book on the scientific study of meaning in life, and authored the book Nostalgia: A Psychological Resource. His work has been featured by the New York Times, New Yorker, NPR, BBC, CNN, CBC, ABC News, CBS News, The Atlantic, Men's Health, Women's Health, and Cosmopolitan. He also regularly serves as an expert guest on national and international radio programs.