Wendy D. Manning is the founder of the Center for Family and Demographic Research and currently serves as its Development Core Co-Director. She is also the Co-Director for the National Center for Family & Marriage Research and served as PAA President in 2018. She is a family demographer, and her research examines how family members define and understand their obligations to each other in an era of increasingly diverse and complex family relationships. She led the research for the ASA Amicus Brief filed to the U.S. Supreme Court in same-sex marriage cases. Manning has examined the meaning of cohabitation with her work on the measurement of cohabitation, fertility in cohabiting unions, the stability of cohabiting unions, transitions to marriage, and implications of cohabitation for adult and child well-being. Her work has focused on adolescent sexual decision-making as well as the patterning and quality of young adult relationships.