Kenneth T. Jackson is the Jacques Barzun Professor of History at Columbia University, where he has chaired the Department of History. The author of the prize-winning Crabgrass Frontier: The Suburbanization of the United States, he has taught New York City history for four decades. He is general editor of the Columbia History of Urban Life and a former president of the Urban History Association, the Society of American Historians, the Organization of American Historians, and the New-York Historical Society.