Stephen Maas received BSEE and MSEE degrees in Electrical Engineering from the University of Pennsylvania in 1971 and 1972, respectively, and a Ph. D. in Electrical Engineering from UCLA in 1984. He has been involved in research, design, and development of low-noise and nonlinear microwave circuits and systems at the National Radio Astronomy Observatory (where he designed the receivers for the Very Large Array), Hughes Aircraft Co., TRW, the Aerospace Corp., and the UCLA Department of Electrical Engineering. Subsequently he worked as an engineering consultant and founded Nonlinear Technologies, Inc., a consulting company, in 1993. He was a principal and Chief Scientist of AWR Corporation, now part of Cadence Design systems, and has contributed substantially to the circuit simulator Microwave Office.
Dr. Maas is the author of Microwave Mixers (Artech House, 1986 and 1992), Nonlinear Microwave Circuits (Artech House, 1988; second edition 2003), The RF and Microwave Circuit Design Cookbook (Artech House, 1998),Noise in Linear and Nonlinear Circuits (Artech House, 2005), and Practical Microwave Circuits, (Artech House, 2014). From 1990 until 1992 he was the editor of the IEEE Transactions on Microwave Theory and Techniques and from 1990-93 was an Adcom member and Publications Chairman of the IEEE MTT Society. He received the Microwave Prize in 1989 for his work on distortion in diode mixers and the MTT Application Award in 2002 for the low-distortion FET resistive mixer. He is a Life Fellow of the IEEE.