The here presented biography of Bolesław Sobociński (1906–1980) describes the history of his life, his patriotic activity and scientific results. Sobociński, as a pupil of Jan Łukasiewicz and Stanisław Leśniewski, was one of the main representatives of the second generation of the Lvov-Warsaw School, a member of the Warsaw School of Logic. He is known as the most influential popularizer of Leśniewski's systems of prothotetics, ontology and mereology, on the international stage, as well as the author of many important results in symbolic logic: many-valued logics, modal logics, as well in set theory and theory of algebras. The international community of logicians knows Sobociński as the creator and, for many years, editor of the prestigious scientific periodical Notre Dame Journal of Formal Logic. The material is divided in the following parts: (1) Life, (2) National service, (3) Academic career, (4) Interests and achievements, (5) Sobociński presonally, (6) Selected publications by Bolesław Sobociński.