Abstract Karl Popper (1902-1994) was a noted philosopher, born and educated in Vienna, who from 1946 on taught at the London School of Economics. He first met Gödel in 1935 when he gave a presentation to the Menger Colloquium. Another meeting took place in 1950, when, on a visit to Princeton, Popper went to see Gödel to discuss Gödel 1949a. On 24 March 1964, Popper wrote Gödel two letters. The first invited Gödel to a meeting of the British Society for Philosophy of Science in London, planned for July 1965, which was to include a session on foundations of mathematics. Popper elaborated: