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Both authors are retired from the Department of Chemical Engineering at the University of Florida in Gainesville. Seymour Block, Ph.D., is a past president of the American Chemical Society, though he long ago became an aficionado of and expert on Ben Franklin. He's written two well-reviewed trade books on Franklin, not to mention several academic books in chemistry/chemical engineering (including one chemE reference book now in its 5th edition). Block has been interviewed on the History Channel on Franklin and his inventions and has written a number of popular articles on him, most recently the feature cover article for American History magazine (February 2006, "Benjamin Franklin: America's Inventor"). Santiago Tavares, Ph.D., has researched applied and computational math and is an author of one academic/professional math book.