His name was Umesao Tadao.
A Japanese Indiana Jones, Umesao did fieldwork in Afghanistan and Central Asia and later hiked on foot over much of Southeast Asia and Europe, in search of evidence bearing on his ecological theory of civilizations, a mixture of Marx and Hegel modified through his own observations. He saw Eurasia divided into Region 1, a periphery where rich soils and temperate climates made possible the development of agricultural civilizations, feudalism, and then the modern state, and Region 2, the central Asian core from which pastoralists, organized into transient hordes/empires, periodically invaded the periphery, but were never able to keep their act together to develop enduring states. As a writer, he was both popular and prolific. His complete works (starting with notes taken in high school) run to 22 volumes, published as a complete set by a major Japanese publisher. He was also a skillful academic entrepreneur and public intellectual, the founder of Japan's National Institute of Ethnology and several other institutions.
To learn more, see the Minpaku Newsletter, No. 32.