Ludwig Heinrich Edler von Mises (1881-1973) was the acknowledged leader of the Austrian School of economic thought, a prodigious originator in economic theory, and a prolific author. Mises’ writings and lectures encompassed economic theory, history, epistemology, government, and political philosophy. His contributions to economic theory include important clarifications on the quantity theory of money, the theory of the trade cycle, the integration of monetary theory with economic theory in general, and a demonstration that socialism must fail because it cannot solve the problem of economic calculation. Mises was the first scholar to recognize that economics is part of a larger science in human action, a science which Mises called “praxeology”. He taught at the University of Vienna and later at New York University. Mises wrote many works on two related economic themes: 1. monetary economics, inflation, and the role of government, and 2. the differences between government-controlled economies and free trade. His influential work on economic freedoms, their causes and consequences, brought him to highlight the interrelationships between economic and non-economic freedoms in societies, and the appropriate role for government.