With the dominance of functionalism through the middle years of the 20th century, the sociology of knowledge tended to remain on the periphery of mainstream sociological thought.. 
Valéry Yakovlelé Leontiev (, ọjọ́ ìbí 19 March, 1949) jẹ́ olórin ọmọ ilẹ̀ Russia.Ibùdó lórí Interyàrá  Websiteolórinàwọn ará Rọ́ṣíà.. 