Stephen A. Maas is the chief scientist at Applied Wave Research in El Segundo, CA. The Artech House series editor of microwave software, Dr. Maas is also the author of Nonlinear Microwave and RF Circuits, Second Edition, The RF and Microwave Circuit Design Cookbook, and Microwave Mixers, Second Edition (Artech House 2003, 1998, 1993), and the coauthor of C/NL for Windows 95, NT and 3.1: Version 1.2 (Artech House 1996). He holds a Ph.D. in electrical engineering from UCLA.