The book tells about the life and work of the remarkable Soviet theoretical physicist M. P. Bronstein. His most important contribution to science was the first in-depth study of the quantization of gravity. The results he obtained have become especially relevant in our time, when the construction of a quantum theory of gravity is urgently necessary for cosmology and elementary particle physics. Bronstein also carried out important works in relativistic cosmology, astrophysics, and semiconductor theory. The wonderful popular science and scientific fiction books he wrote are being republished today. The book is intended for readers interested in the history of Soviet science.