Von Glasersfeld coined the term radical constructivism and spent large parts of his life in Ireland (1940s), in Italy (1950s) where he worked with Silvio Ceccato, and in the US.
Сам термин «Радикальный конструктивизм» был им введён в конце 1970-х гг в работе "Radical constructivism and Piaget’s concept of knowledge" (Glasersfeld E. von, 1978).