John Bowen received his BS in Electrical Engineering from the Massachusetts Institute of Technology in 1981 and his PhD in Optics from the University of Rochester in 1991. His PhD research was on the design and measurement of optical systems containing gradient index microlenses. From 1991 to 1995 John was employed at Rochester Photonics Corporation, where he developed manufacturing processes for diffractive optics. He has held positions at Spectra-Physics as a Manufacturing Engineer, at Alcon Laboratories as a Senior Scientist responsible for new ophthalmic surgical products, and at Eastman Kodak in optical process development and metrology. Since 2000 John has been a principal and senior engineer at Photon Gear in Ontario, NY. Photon Gear designs and builds high precision optical assemblies to support the semiconductor, biomedical, and metrology industries. John’s responsibilities include optical modeling, design, and analysis, and support of manufacturing and testing. His teaching interests are centered on optical systems design, encompassing optical, mechanical, and electrical aspects.