Delly, John Gustav: - John Gustav Delly is professor emeritus of chemical microscopy at The McCrone Group's Hooke College of Applied Sciences and scientific advisor at McCrone Associates in Illinois. He has more than 50 years of experience in microscopical research, particularly contaminant identification. He has taught courses in microscopy and photomicrography, and developed microscopy training for specific industries. A designer of microscopical accessories, he is the author of more than 500 publications, including Kodak's Photography Through the Microscope. During his professional career, he was a member of the Royal Microscopical Society, the Quekett Microscopical Club, the Postal Microscopical Society, the New York Microscopical Society (former educational chairman), the State Microscopical Society of Illinois (1995 National Award Recipient and honorary member), the Microscope Historical Society, the Microscopical Society of Southern California, the American Chemical Society, and the American Scientific Glassblowers Society. He has also served as an adjunct professor at Rochester Institute of Technology, and has judged entries for photomicrography competitions, including Nikon's Small World and the Polaroid Instant Photomicrography Competition.