During the 1940s, Rothbard became acquainted with Frank Chodorov and read widely in libertarian-oriented works by Albert Jay Nock, Garet Garrett, Isabel Paterson, H. L. Mencken, and Austrian economist Ludwig von Mises. In the early 1950s, when Mises was teaching in the Wall Street division of the New York University Stern School of Business, Rothbard attended his unofficial seminar. Rothbard was greatly influenced by Mises's book "Human Action". He attracted the attention of the William Volker Fund, a group that provided financial backing to promote right-wing ideologies in the 1950s and early 1960s. The Volker Fund paid Rothbard to write a textbook to explain "Human Action" in a form that could be used to introduce college undergraduates to Mises's views; a sample chapter he wrote on money and credit won Mises's approval. For ten years, the Volker Fund paid him a retainer as a "senior analyst". As Rothbard continued his work, he enlarged the project. The result was his book "Man, Economy, and State", published in 1962. Upon its publication, Mises praised Rothbard's work effusively.