He has also taught at the University of Michigan, the University of Virginia, and Colby College since completing his PhD at Yale University in 1999. Keller is the author of the forthcoming Preachers, Poets, Women & the Way: Izumi Shikibu and the Buddhist Literature of Medieval Japan (Ann Arbor: University of Michigan Center for Japanese Studies, in press), and numerous articles in the journals Monumenta Nipponica, Women and Performance, Asian Folklore Studies, Japanese Journal of Religious Studies, and Japanese Language and Literature.