David Cycleback is an art and artifacts historian and philosopher, 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 Chinese. He has advised and examined material for major auction houses and institutions, was an articles writer for the 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, Noise Music Theory, 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).