Philip Joseph Deloria is a historian, author and member of the Dakota Nation who specializes in Native American, Western American, and environmental history. He is the son of scholar Vine Deloria, Jr., and the great nephew of ethnologist Ella Deloria. Deloria is the author of the award-winning books Playing Indian (1999) and Indians in Unexpected Places (2004), among others. Deloria received his Ph.D. in American Studies from Yale University and currently teaches in the Department of History at Harvard University.In 2021 he was elected to the American Philosophical Society.