Sherif Girgis, co-author of What Is Marriage? Man and Woman: A Defense (2012), is currently pursuing his Ph.D. in philosophy at Princeton and his JD at Yale Law School. He majored in philosophy at Princeton, where he won several academic prizes, including for his senior thesis on sex ethics. Upon graduating Phi Beta Kappa and summa cum laude in 2008, he went on to earn a masters degree in moral, political and legal philosophy at Oxford as a Rhodes Scholar. His paper What Is Marriage?, coauthored with Robert George and Ryan Anderson, quickly became Social Science Research Networks most downloaded paper of its year. Their book on the same subject, which improves and expands on the article, was released in 2012. In addition to publishing in more popular contexts, he has given lectures and talks and engaged in debates on marriage and related topics throughout the U.S. and abroad.