John D. DeLamater, Conway-Bascom Professor of Sociology at the University of Wisconsin-Madison, received his education at the University of California, Santa Barbara, and the University of Michigan. He earned his Ph.D. in Social Psychology in 1969. He has been teaching the undergraduate course in social psychology since 1970, and graduate courses and seminars in the area since 1981. He leads a seminar on teaching for graduate students, and has won several teaching awards. He is the Editor of the Handbook of Social Psychology, published by Springer. His research and writing are focused on the effects of life-course transitions on sexuality. He has published papers on the effects of having a child, of dual-career couples, of divorce, and influences on sexual desire and sexual behavior among men and women over 45. His current research is concerned with sexual behavior in later life, and the extent and ways that couples negotiate various nonmonogamous lifestyles.