Lev Vygotsky, Belarusian-Russian psychologist and philosopher (died 1934)

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.