Ed Friedman earned a B.S. in physics at the University of Mary in 1966 and a Ph.D. in cryogenic physics from Wayne State University in 1972. He started his career in the field of ocean optics and subsequently developed system concepts for remote sensing of the atmosphere and oceans. After completing studies related to the design of spacecraft and instruments for the measurement of the radiation balance of the Earth, he was appointed a visiting scientist in the climate program at the National Center for Atmospheric Research (NCAR). Subsequent employers included The Mitre Corporation, Martin Marietta (where he met the co-author), Ball Aerospace and Technologies Corporation, and the Boeing Company, where he currently serves as a Technical Fellow in the Lasers and Electo-Optics Division. In the last ten years, he has concentrated on the development of mission concepts and technologies for astrophysics and space science. While at Ball, he was Chief Technologist of the Civil Space business unit. Recent areas of interest include the use of space-based interferometers to create detailed maps of stellar positions and the use of coronagraphic methods for detection of planets in distant solar systems. In 2001, he was awarded a patent for a novel method of alignment and phasing of large, deployed Earth-viewing optics. He has been a patent reviewer for the journal Applied Optics and an editor for the journal Optical Engineering. Dr. Friedman has published more than 10 peer-reviewed papers on remote sensing, diffractive beam propagation, and ocean optics. Early in his career, he published a book and approximately ten articles on electronics. While a visiting scientist at NCAR, he published five articles on the role of remote sensing in detecting human influences on climate. He is the coauthor of the two previous editions of this book. Ed recently retired after two seasons as a member of the National Ski Patrol. He and his wife Judith Friedman live in the mountains west of Boulder, Colorado. John Lester Miller earned a B.S. in Physics at the University of Southern California in 1981, participated in physics, math, and engineering graduate studies at Cal State Long Beach and the University of Hawaii, then earned an M.B.A. from Regis University in 1989. He chairs the SPIE session of advanced infrared technology, co-chairs the session on homeland security, and referees papers for several electro-optical journals. He has held positions as Chief Scientist, Director of Advanced Technologies, Program Director, Functional Manager, Lead Engineer, and Electro-Optical Engineer with FLIR Systems (Portland, Oregon), the Research Triangle Institute (Lake Oswego, OR), Martin Marietta/Lockheed Martin (Denver, Colorado; Utica, New York; and Orlando, Florida), the University of Hawaii's NASA IRTF (Hilo, Hawaii), Rockwell International (Seal Beach, California), Mt. Wilson and Palomar Observatories (Pasadena, California), and Griffith Observatory (Los Angeles, California). While at Martin Marietta in Denver, he met Ed Friedman. He has published more than 40 papers on optical sciences and is the author of Principles of Infrared Technology and the co-author of the two previous editions of this book. John has several patents pending in electro-optical technologies. His experience includes leading integrated research, design, and marketing efforts on advanced security systems, active imagers, infrared sensors, space sensors, helmet-mounted systems, scientific instrumentation, homeland security surveillance systems, radiometric test facilities, aviation enhanced vision systems, and environmental and weather monitoring sensors. John is Vice President of Advanced Technology for FLIR Systems, Inc., in Portland, Oregon. He and his wife, Corinne Foster, split their time between Lake Oswego and Bend, Oregon.