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Dr. Farmer is the Walter H. Annenberg Professor of History at the University of Pennsylvania. His temporal expertise is the long nineteenth century; his regional expertise is the American West. His recent work has turned to global environmental history across the modern period. Originally from Provo, Utah, Farmer earned his degrees from Utah State, the University of Montana, and Stanford. He has family roots in Bear Lake County, Idaho, and is a past and future resident writer at the Ernest and Mary Hemingway House in Ketchum. Prof. Farmer is the award-winning author of four books, most recently Elderflora: A Modern History of Ancient Trees. He’s on Instagram and Twitter @geohumanist. Learn more at