The monograph is dedicated to the life and work of the outstanding American astrophysicist, a native of Russia, O. L. Struve. The author's narration covers all areas of manifestation of the scientific genius of the last representative of the famous astronomical dynasty of Struve - an innovator in stellar spectroscopy, who stood at the origins of radio astronomy, a deserved winner of all prestigious awards in the field of astronomy, vice-president, and then president of the International Astronomical Union. All periods of his turbulent life in the book are supplemented with documentary material: fragments from the scientist’s correspondence, memories of him, previously unpublished. A complete bibliography of the scientist’s works is provided (more than 1000 works). For a wide range of readers interested in the development of world science.