De Simone is the the Eric Weinmann Librarian at the Folger Shakespeare Library in Washington, D.C. Previously he served as Curator of the Lessing J. Rosenwald Collection of The Library of Congress, since January 2000. Before joining the LOC he ran his own rare book company in NYC. Over the past 35 years he has developed expertise in antiquarian bibliography, illustrated books, 18th-century French and Italian books, and 18th-century Irish books. His award-winning exhibition and catalogue of the illustrated book in the hand press period, A Heavenly Craft: the Woodcut in Early Printed Books, features 84 treasures from the Rosenwald collection. He received his B. A. from Clark University, Worcester, MA. and a M. A. from the University of Dayton.