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David Rudd Cycleback is an art historian and forensic scientist specializing in the areas of authenticy and cognition. He is the photography advisor for Beckett Media, has advised and examined artifacts for major auction houses and was a writer for the Encyclopedia of Nineteenth-Century Photography, the standard academic reference. His books include Judging the Authenticity of Photographs, Judging the Authenticity of Prints by the Masters, Forensic Light: A Beginner's Guide and Conceits: Human Cognition and Perception. He has been cited by the Australian National Archives, Indiana Historical Society, York University, Encyclopedia Britanica, University of Wisconsin (The Scout Project), Maine Antiques Digest, PBS, University of Arkansas' Criminal Justice Institute, Bloomberg and Sydney University (Business of Art). Thank you for visiting and feel free to email questions or comments. Email: cycleback (at) cycleback (dot) com