लेखक: Knowles Scott Gabriel Knowles

<b>Arthur P. Molella</b> is curator emeritus at the Smithsonian’s Lemelson Center for the Study of Invention and Innovation, for which he was founding director. He is coeditor of Inventing for the Environment and Places of Invention and coauthor of Invented Edens: Techo-Cities of the 20th Century and World’s Fairs on the Eve of War. He is a member of the Society for the History of Technology and serves on the Executive Advisory Board of the National Academy of Inventors and the National Inventors Hall of Fame. <b>Scott Gabriel Knowles</b> is professor and head of the department of history at Drexel University. He is a research fellow of the Disaster Research Center of the University of Delaware. Knowles is the author of The Disaster Experts: Mastering Risk in Modern America and editor of Imagining Philadelphia: Edmund Bacon and the Future of the City.