 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 and 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.With the help of Mises, in the late 1920s he 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.