Jon M. Duff received his Ph.D. in art education from The Ohio State University after undergraduate and graduate study in technology at Purdue University. He then served on the faculty in Engineering Graphics at Ohio State and in Technical Graphics at Purdue. Professor Duff currently teaches a variety of courses at Arizona State University, including modeling, animation, illustration, and technical publishing. He is the author of over 70 technical papers and 17 texts on industrial graphics and has served as a consultant to education, industry, and government for over 30 years
William A. Ross is a doctoral student at the University of Cambridge.