Stability Analysis for Two-Dimensional Systems

from the Polytechnic Institute of Brooklyn, Brooklyn, NY, in 1955, 1956, and 1968, respectively (Westinghouse Fellow 1956, Bell Telephone Laboratories Fellow 19571958). Since 1958 he has been employed by Bell Laboratories, Murray Hill, NJ, where he presently is a Member of the Mathematical Studies Department. He has been concerned with analysis of radar systems for military defense, synthesis and analysis of active and time-varying networks, with several studies of properties of nonlinear systems, and with some problems in communication theory and numerical analysis. His more recent interests have included compartmental models, the theory of digital filtering, global implicit-function theorems, and functional expansions for nonlinear systems. He is a former Vice Chairman of the IEEE Group on Circuit Theory, and a former Guest Editor of the IEEE TRANSACTIONS ON CIRCUIT THEORY Special Issue on Active and Digital Networks. Dr. Sandberg is a member of the American Association for the Advancement of Science, Eta Kappa Nu, Sigma Xi, Tau Beta Pi, and the National Academy of Engineering.