She teaches the environmental history of North America, with a particular focus on the intersections of environmental change with politics, law, and agriculture. Her current research examines the history of the several Homestead Acts and their impacts on the landscape of the U.S. West between 1862 and 1986. Gregg received her PhD from Columbia University and has written two books, Managing the Mountains: Land Use Planning, the New Deal, and the Creation of a Federal Landscape in Appalachia, and American Georgics: Writings on Farming, Society, and the Land (edited with Brian Donahue and Edwin Hagenstein). She has served on the board of directors of the Forest History Society, on the executive committee of the American Society for Environmental History, and is an associate editor for the journal Agricultural History. She moved to Lawrence from Washington, DC in 2010.