Howard J. Markman, PhD, is a distinguished professor of psychology at the University of Denver and the founder of the internationally known ­evidence-based couples relationship education program, PREP (Prevention and Relationship Education Program).

Scott M. Stanley, PhD, is a research professor at the University of Denver, specializing in research on commitment, relationship development, and prevention. He has been involved in the development of PREP for over 30 years.

Galena K. Rhoades, PhD, is a research professor and the director of the Institute for ­Relationship Science in the Department of Psychology at the University of Denver. She also founded a nonprofit in Denver called Thriving Families and is a practicing clinical psychologist.

Janice R. Levine, PhD, is a clinical psychologist who specializes in couples relationships and family development. She is coauthor of three books, founder of The Couples Health Program and is featured as a Top Doc in the Best in Massachusetts magazine.