Stephen J. Young is a Senior Research Scientist at The Aerospace Corporation. He received his Ph.D. in physics in 1968 from the University of Alaska. Dr. Young was introduced to band model methods for radiation transport while serving as an officer in the U.S. Army at the Cold-Regions Research and Engineering Laboratory, where he investigated the transport of infrared radiation through ice fog. He was later reintroduced to the subject at The Aerospace Corporation through association with Dr. Fred Simmons and research on the transport of rocket-exhaust radiation through the terrestrial atmosphere.