Abstract
The article is devoted to the Soviet and Russian legal scientist, corresponding member of the Academy of Sciences of the USSR and the Russian Academy of Sciences, Doctor of Law, Professor, Laureate of the USSR State Prize, Honored Scientist of the RSFSR Sergey S. Alekseev. The work presents the main stages of the scientist’s life and work, as well as reveals his contribution to the development of the theory of state and law, Constitutional and Civil Law. The main attention is paid to the scientific activity of S. S. Alekseyev, his work as Chairman of the Committee of the Supreme Soviet of the USSR on Legislation and Chairman of the Committee for Constitutional Supervision of the USSR, characterized his role in the preparation of drafts of the Constitution of the Russian Federation and the Civil Code of the Russian Federation.