The brochure is dedicated to the life and scientific work of the outstanding modern mathematician 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, Hip theory, etc. d) and its applications. The brochure is intended for scientists, engineers, students and anyone interested in mathematics, its applications and history. Contents: From the author Preface No more than one-fourth. The beginning of the journey A lion is recognized by its claws Johnny Sketches for the portrait “Unexpected Help” Joniak The computer and the brain Epilogue Appendix . The role of mathematics in the sciences and in societyLiterature