Economist and political theorist Friedrich Hayek came to know Mises while working as Mises' subordinate at a government office dealing with Austria's post-World War I debt. Hayek wrote, "there I came to know him mainly as a tremendously efficient executive, the kind of man who, as was said of John Stuart Mill, because he does a normal day's work in two hours, always has a clear desk and time to talk about anything. I came to know him as one of the best educated and informed men I have ever known...". Hayek's development of Mises' theoretical work on the business cycle later earned Hayek the 1974 Nobel Prize in Economics (shared with Swedish economist Gunnar Myrdal).