Relevance. Scientific and scientific-organizational activity of a world-famous psychologist A.N. Leontiev is a constant interest of specialists in the field of humanistics, methodologists and historians of psychology. In connection with the 115th anniversary of this outstanding scientist, it seems relevant to remind readers of the poorly studied aspects of his life creation.

Objective. Description of contribution А.N. Leontiev in the development of engineering-psychological, ergonomic and reflexive-acmeological problems in the 1950-1970's.

Methods. Science-research analysis (from the positions of reflexive psychology and personology), and methodological analysis.

Results. The author analyzes such aspects of the scientific heritage of A.N. Leontiev, as his fundamental research of productive thinking and scientific creativity, as well as applied developments in the field of engineering psychology and ergonomics. The fundamental contribution of the scientist to modern human studies and to the institutional construction of psychological science is shown. 

Conclusions. Scientific creativity of A.N. Leontiev in the field of psychology is interdisciplinary in nature, because it synthesizes the methodological orientations of modern humanities - natural science, technology cybernetic, social and humanitarian. The crown of the enormous scientific and organizational activity of A.N. Leontiev became a large-scale institutionalization of Russian psychology, which demanded from him not less vision and intuition, intelligence and will, diplomacy and energy than his outstanding creative activity in the field of philosophy, psychology, ergonomics and pedagogy.