Scott Stanley, Ph.D., is a research professor and codirector of the Center for Marital and Family Studies at the University of Denver. He has published widely in terms of journal articles and book chapters, with research interests including relationship commitment, cohabitation, conflict, confidence, risk factors for divorce, and the prevention of marital distress. Along with Dr. Howard Markman and colleagues, he has been involved in the research, development, and refinement of the Prevention and Relationship Enhancement Program (PREP) for over 30 years. Among various studies, Stanley, Elizabeth Allen, Howard Markman, and Galena Rhoades are conducting a randomized trial of a variant of PREP in the U.S. Army, funded by The National Institute of Child Health and Human Development (NICHD). Stanley and colleagues Galena Rhoades and Howard Markman have been conducting a large-sample, longitudinal study of unmarried individuals in serious romantic relationships, examining cohabitation and other dynamics in couple development (this data collection was also funded by NICHD). Stanley has coauthored or authored various books, including Fighting for Your Marriage, 12 Hours to a Great Marriage, and The Power of Commitment, and co-authored relationship education curricula such as PREP, Within My Reach, Within Our Reach, and On My Shoulders. Stanley has a popular blog on issues about marriage and romantic relationships at www.slidingvsdeciding.com.