John Corvino, Ph.D. is Professor and Chair of the Philosophy Department at Wayne State University in Detroit, Michigan. He is the co-author (with Maggie Gallagher) of Debating Same-Sex Marriage (June 2012) and the author of What's Wrong with Homosexuality? (January 2013), both from Oxford University Press. Ryan T. Anderson, Ph.D., is William E. Simon Senior Research Fellow at The Heritage Foundation. He is author of Truth Overruled: The Future of Marriage and Religious Freedom (Regnery, 2015), co-author of What Is Marriage? Man and Woman: A Defense (Encounter, 2012) and co-editor of A Liberalism Safe for Catholicism (University of Notre Dame Press, 2017). Sherif Girgis, J.D., is a Ph.D. candidate in philosophy at Princeton and lead author (with Ryan T. Anderson and Robert P. George) of What Is Marriage? Man and Woman: A Defense (Encounter Books, 2012). He earned a law degree from Yale and a B.Phil. (M.Phil.) in philosophy from Oxford as a Rhodes Scholar.