John R. Ragazzini

John R. Ragazzini
Fields of study


John R. Ragazzini (IRE Associate 1941, Member 1946, Senior Member 1952, and Fellow 1955) was born in New York, N.Y., on 3 January 1912. He received the B.S. and E.E. degrees from the College of the City of New York (C.C.N.Y.), in 1932 and 1933, respectively, and the A.M. and Ph.D. degrees from Columbia University, N.Y. in 1938 and 1941, respectively.

He began his teaching career in the School of Technology at C.C.N.Y. , later going to Columbia University where he became a Professor of Electrical and Chair of the department. In July 1958, he left Columbia University to become Dean of the College of Engineering at New York University.

During World War II, he directed research at Columbia University in the area of fire and bombing control by means of electronic simulators. This work led to many of the early developments in electronic analog computers and simulators. His later research was in the field of control systems and, more specifically, in sampled-data control systems.

In 1950, he co-authored, with Lotfi A. Zadeh, a seminal paper on an extension of Wiener's theory of prediction. In 1952, he co-authored, also with Lotfi A. Zadeh, a paper on sampled-data systems which led to the widely used method of z-transformation.

Ragazzini also worked as a consultant in the fields of computers, control, and guidance systems for a number of industrial organizations. he was a member of Phi Beta Kappa, Tau Beta Pi, Sigma Xi, and Eta Kappa Nu.