Lev Semionovič Vygotskij

Lev Semyonovich Vygotsky was a Russian and Soviet psychologist, best known for his work on psychological development in children and creating the framework known as cultural-historical activity theory. After his early death, his books and research were banned in the Soviet Union until Joseph Stalin's death in 1953, with a first collection of major texts published in 1956. A Review of General Psychology survey, published in 2002, ranked Vygotsky as the 83rd most cited psychologist of the 20th century.