Question: Who did Hayek work for upon being hired by the author of Bureaucracy?

Knowledge 1: Bureaucracy (book)
Bureaucracy is a political book written by Austrian School economist and libertarian thinker Ludwig von Mises. The author's motivation in writing the book is his concern with the spread of socialist ideals and the increasing bureaucratization of economic life. While he does not deny the necessity of certain bureaucratic structures for the smooth operation of any civilized state, he disagrees with the extent to which it has come to dominate the public life of European countries and the United States. The author's purpose is to demonstrate that the negative aspects of bureaucracy are not a result of bad policies or corruption, as the public tends to think. Instead, he explains, those problems are necessarily built into bureaucratic structures. They are due to the very tasks such a system has to deal with. The main body of the book is therefore devoted to a comparison between private enterprise on the one hand and bureaucratic agencies/public enterprise on the other. [SEP] Knowledge 2: Friedrich Hayek
During Hayek's years at the University of Vienna, Carl Menger's work on the explanatory strategy of social science and Friedrich von Wieser's commanding presence in the classroom left a lasting influence on him. Upon the completion of his examinations, Hayek was hired by Ludwig von Mises on the recommendation of Wieser as a specialist for the Austrian government working on the legal and economic details of the Treaty of Saint Germain. Between 1923 and 1924 Hayek worked as a research assistant to Prof. Jeremiah Jenks of New York University, compiling macroeconomic data on the American economy and the operations of the US Federal Reserve.
Knowledge 1: Bureaucracy (book)
Bureaucracy is a political book written by Austrian School economist and libertarian thinker Ludwig von Mises. The author's motivation in writing the book is his concern with the spread of socialist ideals and the increasing bureaucratization of economic life. While he does not deny the necessity of certain bureaucratic structures for the smooth operation of any civilized state, he disagrees with the extent to which it has come to dominate the public life of European countries and the United States. The author's purpose is to demonstrate that the negative aspects of bureaucracy are not a result of bad policies or corruption, as the public tends to think. Instead, he explains, those problems are necessarily built into bureaucratic structures. They are due to the very tasks such a system has to deal with. The main body of the book is therefore devoted to a comparison between private enterprise on the one hand and bureaucratic agencies/public enterprise on the other. [SEP] Knowledge 2: Friedrich Hayek
With the help of Mises, in the late 1920s Hayek founded and served as director of the Austrian Institute for Business Cycle Research, before joining the faculty of the London School of Economics (LSE) in 1931 at the behest of Lionel Robbins. Upon his arrival in London, Hayek was quickly recognised as one of the leading economic theorists in the world, and his development of the economics of processes in time and the co-ordination function of prices inspired the ground-breaking work of John Hicks, Abba Lerner, and many others in the development of modern microeconomics.
Knowledge 1: Bureaucracy (book)
Bureaucracy is a political book written by Austrian School economist and libertarian thinker Ludwig von Mises. The author's motivation in writing the book is his concern with the spread of socialist ideals and the increasing bureaucratization of economic life. While he does not deny the necessity of certain bureaucratic structures for the smooth operation of any civilized state, he disagrees with the extent to which it has come to dominate the public life of European countries and the United States. The author's purpose is to demonstrate that the negative aspects of bureaucracy are not a result of bad policies or corruption, as the public tends to think. Instead, he explains, those problems are necessarily built into bureaucratic structures. They are due to the very tasks such a system has to deal with. The main body of the book is therefore devoted to a comparison between private enterprise on the one hand and bureaucratic agencies/public enterprise on the other. [SEP] Knowledge 2: Friedrich Hayek
Initially sympathetic to Wieser's democratic socialism, Hayek's economic thinking shifted away from socialism and toward the classical liberalism of Carl Menger after reading von Mises' book Socialism. It was sometime after reading Socialism that Hayek began attending von Mises' private seminars, joining several of his university friends, including Fritz Machlup, Alfred Schutz, Felix Kaufmann, and Gottfried Haberler, who were also participating in Hayek's own, more general, private seminar. It was during this time that he also encountered and befriended noted political philosopher Eric Voegelin, with whom he retained a long-standing relationship.

Answer: the Austrian government