The article is prepared on the occasion of the jubilee of Professor Yury N. Stolyarov, a prominent Russian scholar, pedagogue, science organizer, Doctor of Science in Pedagogy. The authors analyze the key vectors and products of his scholarly endeavors. His authority and status in the library theory and practice are high. The authors discuss Y. Stolyarov's contribution into modern library science, bibliology, documentology in the subject field of library science and practice. The authors emphasize his most significant achievements in methodology (structural and functional approach in library science, documentology development and institutionalization); terminology and its formation mechanisms; historical reconstruction of book culture origins; preservation and promotion of the legacy of famous librarians and library scientists of the past and present; theoretical and practice-oriented tools of library collection studies; scientific background of library policy; original approaches toward library profession studies and management; and science organization. The authors examine each group of achievements through the prism of the well-known and most significant theoretical and practical works by Yury N. Stolyarov.