He has received grants and fellowships from the John Simon Guggenheim Memorial Foundation, the National Endowment for the Humanities, and the Huntington Library. In 1996 he was the Hurst Visiting Professor at Washington University in St. Louis, and in 2002 he was the Helen Cam Fellow in Medieval Studies at Cambridge University. In 2015 he was the Keeley Visiting Fellow at Wadham College, Oxford. In 2016 he served as the M. H. Abrams Distinguished Visiting Professor at Cornell University.
