J.S.: Before World War II, most of the world’s prominent mathematicians were European born and trained. Your own generation was the fi rst in which that center of gravity shifted to the United States. You and Michael Artin are in fact among the few MIT mathematicians of your generation who were born in Europe, Artin in Hamburg and you in Rakvere, Estonia, though both of you moved here as children. Do you have memories from Rakvere?