This article, dedicated to the 80th birthday of Professor Boris V. Rossinsky, evaluates the outstanding scholar's contribution to the science and theory of Russian administrative law. The influence of the ideas and theoretical judgments of B.V. Rossinsky on the formation and development of the scientific views of many generations of Russian lawyers is briefly analyzed. A commentary on some of the monographs and scientific articles written by the author is provided. The fundamental nature of the scholar's scientific views, which formed, changed, developed, summed up, proved, and strengthened the basis of administrative law regulation, is emphasize. A conclusion is made about the significance of the works of B.V. Rossinsky, which clarify the subject matter of the administrative law science. The article examines the researcher's approach to the analysis of the patterns of social relations arising in the process of organizing and operating the system of executive government bodies, as well as other agencies vested with executive powers. It is noted that the scientific achievements of the brilliant administrative scientist are inseparable from the excellent characterization of B.V. Rossinsky, which reveals him as a reliable, responsible person, a talented teacher and like-minded person.