Following up on his successful and highly regarded James Madison and the Making of America (St. Martin’s, 2012), Kevin Gutzman has returned with a fresh look at Jefferson in Thomas Jefferson, Revolutionary: A Radical’s Struggle to Remake America. It could well have been called The Jefferson Nobody Knows. Jefferson, Gutzman reminds us, had such a fertile mind that he would devote himself to the study of a subject and become the leading figure of his day in that area. Architecture may be the most obvious example — at the time of the bicentennial, the American Institute of Architects declared...