The paper is a salute to a preeminent social scholar of our times – Immanuel M. Wallerstein (1930–2019). It briefly highlights his biography, education, and academic career, however, it is mainly concerned with his scholarly concepts and theories. The author attempts to follow the process of development of one of his main contributions to social sciences – the world-systemic approach, as well as to analyze various important aspects of it, including its historiosophic significance. All efforts have been made to keep the paper informative, however also accessible and translucent, conferring, when appropriate, upon Immanuel Wallerstein himself to expound his ideas to the reader. Keywords: antisystemic movements, core countries, division of labor, economic sociology, geoculture, periphery, semi-periphery, world-economy, world-empire, world-system.