Pierre-Yves Mahé
is the founding director of
Spéos - The Paris Photographic Institute, which was created in 1984. The school offers photographic programs in English and French for international university and graduate students, beginners, and professionals. Prior to founding Spéos, he was an advertising photographer for several French companies.The 'Stop-System' method is the result of his professional experience applied to the educational needs of students in the studio and the B&W darkroom. He currently is working on the restoration of Nicephore Niépce's House (the inventor of Photography). Staff from Apple, Canon, Fujfilm, Konica, Minolta, Nikon, Polaroid, Gamma Agency and TempSport were trained at Spéos by him for the use of digital equipment.

Gordon Brown
is a graduate of RIT and worked for Eastman Kodak for 33 years specializing in Photographic Education and Black and White products.
While at Kodak he was instrumental in bringing many B/W products to market, particularly Kodak Technical Pan film and Kodak T-Max film (he even thought up the name). He has authored a variety of pamphlets and articles, and has taught numerous Zone System workshops throughout the United States. He is currently serving as a Kodak Ambassador giving photographic lectures throughout the United States.

Richard D. Zakia
was professor of photography for 32 years at the Rochester Institute of Technology in New York. Prior to joining RIT he worked as photographic engineer at Kodak. He has authored and co-authored several books on photography and perception including 'The New Zone System Manual' with Minor White and 'The Zone Systemizer' with John J. Dowdell III. Along with Dr. Les Stroebel he is co-editor of the '1994 Focal Encyclopedia of Photography'.