About the AuthorsJames W. Nilsson taught at Iowa State University for 39 years. Since retiring from Iowa State, he has been a visiting professor at Notre Dame, California Polytechnic at San Luis Obispo, and the United States Air Force Academy. In 1962, he co-authored (with R. G. Brown) Introduction to Linear Systems Analysis (John Wiley & Sons). In 1968, he authored Introduction to Circuits, Instruments, and Electronics (Harcourt Brace and World). Professor Nilsson received a Standard Oil Outstanding Teacher Award in 1968, the IEEE Undergraduate Teaching Award in 1992, and the McGraw-Hill Jacob Millman Award in 1995. In 1995 he was elected a Fellow of the IEEE.Susan A. Riedel has been a member of the Department of Electrical and Computer Engineering, Marquette University since 1981. She also holds a clinical research appointment with the Department of Orthopaedics, Medical College of Wisconsin. She was a visiting professor with the Bioengineering Unit, University of Strathclyde, Glascow, Scotland, as a Fulbright Scholar during the 1989-1990 academic year. She has received two awards for teaching excellence at Marquette, and was recognized for her research contributions with an award from the Chicago Unit of the Shriner's Hospitals.