This article analyzes the life and scientific career of Vladimir A. Gubin (1951-2021), Doctor of Psychology, Professor, Honored Scientist of the Russian Federation, and a prominent representative of the St. Petersburg scientific school of engineering psychology, work psychology, and organizational psychology. Drawing on biographical data, colleagues’ memoirs, and an analysis scientific publication, the study identifies the key directions of his research. Central to Gubin’s work was the development of theoretical models and original psychodiagnostics systems for assessing professionally important qualities and personality orientation of professionals in extreme occupations, primarily military personnel and prosecutors. He made significant contributions to job analysis of law enforcement activities, psychological and pedagogical support of professional training, investigation of educational environment factors, and psychological compatibility in closed groups. A distinct fundamental direction was his concept of the “psychology of stability,” which examines the individual’s integral ability to maintain health under destructive factors. The article demonstrates that Gubin’s scientific work is characterized by a strong practical orientation - his methods and programs have been validated and implemented in military educational institutions, prosecutor’s offices, naval training centers, and universities of the Russian Ministry of Internal Affairs. Special attention is paid to the scientist’s personality - his determination, pedagogical talent, care for orphaned students, and support for young researchers. The article emphasizes Gubin’s substantial contribution to Russian work psychology, military psychology, and legal psychology, as well as the enduring significance of his scientific legacy for the contemporary theory and practice of psychological support for professional activity