Nancy Leys Stepan is Professor Emeritus of History at Columbia University. She is the author of Eradication, "The Hour of Eugenics": Race, Gender, and Nation in Latin America and Picturing Tropical Nature.Nancy Leys Stepan is Professor Emeritus of History at Columbia University. She is the author of Eradication, "The Hour of Eugenics": Race, Gender, and Nation in Latin America and Picturing Tropical Nature....more