David Rudd Cycleback is an art and artifacts scholar and an internationally known authentication expert. He was a two-time Eric Hoffer Award Finalist for his books Return Trip: Aesthetics and Epistemology and Conceits: Cognition and Perception, and currently is a judge for the award. Reprinted by Beijing's Three Shadows Art Center, his guides Judging the Authenticity of Prints by the Masters and Judging the Authenticity of Photographs were the first comprehensive books on the subjects published in China. He has advised and examined material for major auction houses and institutions, was a writer for the standard academic reference Encyclopedia of Nineteenth-Century Photography and teaches courses in art authentication. His other books include Art Perception, A Brief Introduction to Ancient Counting Systems for Non-Mathematicians, Strange Beauty: Aesthetics and Epistemology, Identifying Antique Commercial Printing Processes And The Basics of Authenticating Antique and Art Prints, Forensic Light: A Beginner's Guide, Noise Music, and Identifying Common Materials in Antiques. He has been been cited by the Australian National Archives, Museum of Innovation and Science, Indiana Historical Society, The Jewish Theological Seminary, Saylor Academy, Encyclopedia of Journalism, University of Wisconsin (The Scout Project), Columbia University Computer Music Center, University of California Center for Learning in the Arts and Sciences and Sydney University (Business of Art).