This article is dedicated to the 80th birthday of Professor Boris Vulfovich Rossinsky, a renowned Russian scholar of administrative law. The article focuses on Professor B.V. Rossinsky's contribution to the development of administrative liability theory. Rossinsky's renowned academic and educational works on this topic are analyzed. Specifically, his works are used to analyze issues related to the concept, essence, and characteristics of administrative liability, the specifics of calculating administrative fines, and determining the guilt of a legal entity. A conclusion is drawn regarding Professor B.V. Rossinsky's significant contribution to the development of administrative liability and the most important promising areas for its improvement.