My lifelong friendship with Fritz Hayek began in September or October of 1935, when I knocked at the door of his study here in the LSE. He was only three years older, and I had heard of him in Vienna; but we had never met. He was young and famous, and I was an unknown schoolteacher. I had a letter of recommendation from Professor Hans Kelsen, then teaching political theory in Vienna. Kelsen had told me to visit Hayek, but had warned me that he and Hayek were not seeing eye to eye.