… 2014/2015 … 2014/2015 A Conversation with Greg Grandin about The Empire of Necessity Monday, December 8, 2014 - … 5:00pm to 6:30pm Greg Grandin will discuss his recent book about The Empire of Necessity: Slavery, Freedom, and … historian, to discuss his new book, Gateway to Freedom, about the Underground Railroad in New York. … Gilder Lehrman …