In 1960, he was appointed to a position in the London School of Economics, where he wrote on the philosophy of mathematics and the philosophy of science.
Το 1960 διορίσθηκε στη London School of Economics, όπου έγραψε πάνω στη φιλοσοφία των μαθηματικών και τη φιλοσοφία της επιστήμης.