Alexander Aronovich Feldbaum (1913 — 1969) was a Soviet scientist in the field of automatic control and fundamental computer science.

In 1937, he graduated from the Moscow Power Engineering Institute, and in 1941, the correspondence department of the MSU Faculty of Mechanics and Mathematics.

A. Feldbaum constructed and theoretically investigated non-linear (quadratic in velocity) feedback, proving that it provides the maximum rate of action in the tracking motor controller system.

A. Feldbaum introduced the concept of the degree of oscillation of transitional processes, proved a number of theorems about the forms of transient processes and their relationship with the distribution of the roots of the characteristic equation, developed criteria for quadratic errors.

He explained and posed the general problem of optimal control to a group of outstanding mathematicians led by Academician L. S. Pontryagin.

A. Feldbaum considered the general problem of synthesizing optimal systems, introducing the fundamental concept of a switching surface in phase space (1955).

He proposed ways to solve synthesis problems of optimal control for systems with incomplete information.

From 1961, he was the head of the laboratory of self-tuning systems at the Institute of Automation and Telemechanics of the USSR Academy of Sciences.