KEITH WAILOO is the Townsend Martin Professor of History and Public Affairs at Princeton University and the author or editor of several books, including "Katrina's Imprint: Race and Vulnerability in America "(Rutgers University Press), "How Cancer Crossed the Color Line," and "Dying in the City of the Blues: Sickle Cell Anemia and the Politics of Race and Health."ALONDRA NELSON is an associate professor of sociology at Columbia University. She is the author of "Body and Soul: The Black Panther Party and the Fight Against Medical Discrimination" and coeditor of "Technicolor: Race, Technology, and Everyday Life."CATHERINE LEE is an assistant professor of sociology and a faculty associate at the Institute for Health at Rutgers University. She is completing a book entitled "Fictive Kin: Family Reunification and the Meaning of Race in Immigration Policy."