About the Editors John Sturge has worked at Xerox Corporation for 18 years in the areas of marketing engineering and research. Currently he is the manager of marketing operations at Xerox's Rochester, New York facility. Earlier, he served as a business venture start-up manager in its Special Products Division, and as manager of a Xerox team of engineers and technicians which tested Xerox's 240 Computer Forms Printer. Previously, he was an optical systems engineer at the Cornell Aeronautical Laboratories in Buffalo, New York. He is the editor of the Seventh Edition of Neblette's Handbook of Photography and Reprography: Materials, Processes, and Systems (Van Nostrand Reinhold, 1977). Mr. Sturge is a graduate of the Rochester Institute of Technology and Rensselaer Polytechnic Institute. Vivian Walworth is an independent consultant in photographic science. She graduated from the University of Michigan with a B.S. in Chemistry. As a member of the Polaroid Research Laboratories (1944-1985), she conducted research in 3-D imaging, color photography, photographic emulsions, spectral sensitization and instant photography. Ms. Walworth is co-author of the chapter "One-Step Photography" in Neblette's Seventh Edition and author of "Color Photography, Instant " in the Kirk-Othmer Encyclopedia of Chemical Technology, 3rd ed., and of "Color Photography" in the McGraw-Hill Encyclopedia of Science and Technology. Allan Shepp is currently involved in laser technology at the Avco Research Laboratories in Everett, Massachusetts. Previously, he worked as senior scientist and manager in Polaroid's industrial and technical photographic division. He has published extensively in the fields of chemical kinetics, fluorescence, silver halide emulsions, monobaths,image evaluation, and polymer imaging. Allan Shepp received a B.S. from Oberlin College and a Ph.D. from Cornell.