The Austrian philosopher Otto Neurath (Vienna 1882 - Oxford 1945) was the only non-architect who participated in the fourth CIAM conference (Congrès International d'Architecture Moderne) that took place in Athens in the summer of 1933. As we read in the minutes of the congress published in the journal of the Technical Chamber of Greece Technika Chronika (Technical Chronicles), it was at the meeting of 13 August 1933 that CIAM members decided to set up two categories of participants: a) partners (mainly young architects and students of architecture), and b) specific members (non-architects participating as full members). The one and only such member was Otto Neurath. Neurath was invited as a representative of the Mundaneum in Vienna in order to cooperate with the CIAM Committee of Statistics which had as its task to collect, review and process statistical data relating to some of the most important cities of the Western world. As noted in the minutes of the congress: ‘The Committee of Statistics in cooperation with the Vienna Mundaneum will collect, review and edit the necessary statistical material which will remain as the property of the Conference.’