Hamilton Cravens is professor of history, Iowa State University. He is author of The Triumph of Evolution: The Nature-Nature Controversy, 1900-1941 and Before Head Start: The Iowa Station and America’s Children.
 
Alan I Marcus is professor of history and director of the Center for Historical Studies at Iowa State University. He is author of Agricultural Science and the Quest for Legitimacy: Farmers, Agricultural College and Experiment Stations, 1870-1890 and Technology in America: A Brief History.
 
David M. Katzman is professor of American Studies and of history at the University of Kansas. He is author of Before the Ghetto: Black Detroit in the Nineteenth Century and Seven Days a Week: Women and Domestic Service in Industrializing America.