Since 2004 Volf has taken part in the Building Bridges Seminar, a yearly gathering of Muslim and Christian scholars chaired until 2012 by the Archbishop of Canterbury, Rowan Williams. His engagement with Islam intensified after the publication of "A Common Word Between Us and You" (2007). Occasioned by Pope Benedict XVI's speech at the University of Regensburg, but motivated by a deteriorated relationship between Christians and Muslims (especially in the wake of 9/11), the document, which was originally signed by 138 of the world's most prominent Muslim leaders, argued that what binds Muslims and Christians (and Jews, of course) is the dual command to love God and love one's neighbors. It proposes this common ground as a place of dialogue and cooperation between the two religions. Along with the staff at the Center for Faith and Culture (Joseph Cumming and Andrew Saperstein), Volf drafted Yale Divinity School's response ("Yale Response"), which was endorsed by over 300 prominent Christian leaders (including some of the world's most respected evangelical figures such as John Stott and Rick Warren).