Mark Norell is curator and chair for the division of paleontology at the American Museum of Natural History. He earned his PhD from Yale University prior to coming to the museum.  His recent books include Discovering Dinosaurs (1995), A Nest of Dinosaurs (2000), Unearthing the Dragon (2005), and the coffee table book The Dinosaur Hunters: The Extraordinary Story of the Men and Women Who Discovered Prehistoric Life , published with co-author Lowell Dingus in 2008. Dr. Norell lives in New York City.   Denise Leidy is curator for the department of Asian Art at The Metropolitan Museum of Art. She received her Masters degree and Ph.D.

from Columbia University and has traveled widely on the Silk Road. She published The Art of Buddhism: An Introduction to Its History and Meaning last year and has also written a new catalogue of the Chinese Buddhist and Daoist sculpture in the Metropolitan Museum of Art . She curated an exhibition on Khubilai Khan and the Mongols in China that opened in November 2010. Dr. Leidy lives in New York City.