Parsons' most famous work, took form piece by piece. Its central figure was Weber, and the other key figures in the discussion were added little by little as the central idea took form. One important work that helped Parsons' central argument in SSA was when in 1932 he unexpectedly found Élie Halévy, La Formation du Radicalisme Philosophique, (1901–1904) a three-volume work, which he read in French. About Halévy work, Parsons explained, "Well, Halévy was just a different world ... and helped me to really get in to many clarifications of the assumptions distinctive to the main line of British utilitarian thought; assumptions about the 'natural identity of interest', and so on. I still think it is one of the true masterpieces in intellectual history."[17] Parsons first achieved significant recognition with the publication of The Structure of Social Action (1937), his first grand synthesis, combining the ideas of Durkheim, Max Weber, and Pareto, among others.