To the 70$^{\rm th}$ Anniversary of Professor Leonid A. Saraev

March 25, 2023 marks the 70$^{\rm th}$ anniversary of the famous Russian scientist, honorary worker of higher and professional education of the Russian Federation, teacher, administrator, organizer of science and higher education in Russia, Doctor of Physical and Mathematical Sciences, Professor Leonid Alexandrovich Saraev.
The article presents the key bibliographic data of Leonid A. Saraev, presents the main scientific directions and results of scientific activity on the fundamental problems of predicting the nonlinear properties of composite materials and the development of mathematical and stochastic methods and models for economic analysis.