David Cycleback is an art historian and philosopher, internationally known authentication expert and Director of Center for Artifact Studies in Seattle. He was a two-time Eric Hoffer Award Finalist for his books Return Trip: Aesthetics and Epistemology and Conceits: Cognition and Perception, the latter used in university courses. 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 an articles writer for the standard academic reference Encyclopedia of Nineteenth-Century Photography and writes an authentication advice column for Sports Collector's Daily. His other books include Art Perception, Looking at Art and Artifacts, A Brief Introduction to Ancient Counting Systems for the Non-Mathematician, Strange Beauty, and Forensic Light: A Beginner's Guide. He has been cited by the Australian National Archives, Museum of Innovation and Science, Indiana Historical Society, The Jewish Theological Seminary, York University, Encyclopedia Britanica, The Saylor Foundation, Encyclopedia of Journalism, University of Wisconsin (The Scout Project) and Sydney University (Business of Art).