Robert L. Norton, P.E. has over 50 years experience in the practice and teaching of mechanical engineering. He holds undergraduate degrees in mechanical engineering and industrial technology from Northeastern University, an M.S.in engineering design from Tufts University, and was awarded a Doctor of Engineering (h.c.) by Worcester Polytechnic Institute. Having first encountered and designed cams for camera mechanisms in 1959 at Polaroid Corporation, Norton has since spent many years designing and analyzing cam-follower systems at Polaroid, Gillette, and many other companies through his consulting practice. He has taught kinematics, dynamics, stress analysis, and machine design to mechanical engineering students for more than 40 years at Northeastern, Tufts, and Worcester Polytechnic Institute, where he is currently the Milton P. Higgins II Distinguished Professor Emeritus. Additionally, Norton has published many technical papers in the literature, several engineering textbooks, and holds 13 U.S. patents. He is a Life Member and Fellow of ASME and a past member of SAE and ASEE. See also http: //www.designofmachinery.com