The "Center of Intercultural Documentation" (CIDOC) in Cuernavaca, Mexico, was directed from 1960 to 1976 by Vienna-born historian and philosopher Ivan Illich (1926-2002). Founded as an education center for American missionaries, it gradually turned into a mixture of conference center, language school, free university, and publishing house. Using a social science technique called Social Network Analysis (SNA) and starting from the CIDOC volume Cuadernos, an analysis of the center is done from a quantitative point of view; Illich is the central character of this book, however, the focus of this work is directed at those who surrounded him during the center's existence. Output of the analysis are two SNA charts. It becomes apparent that Illich's main circle of colleagues comprises three renowned scholars: Radical educational critic Everett Reimer, Joseph Fitzpatrick, Jesuit sociologist from Fordham University New York, and John L. McKnight, professor in Chicago. Other important colleagues were Paulo Freire, Hartmut von Hentig, Valentina Borremans, Francisco Julião and Paul Goodman.