The brochure is devoted to the life and scientific activity of the outstanding mathematician of our time - John von Neumann (1903-1957), who made a fundamental contribution to the creation and development of many areas of modern mathematics (functional analysis, ergodic theory, automata theory, justification of quantum mechanics, game theory, etc.) and its applications. The brochure is designed for scientists, engineers, students, students of folk universities and everyone who is interested in mathematics, its applications and history.