UREM-ULB :
Unité de Recherche sur l’Enseignement des Mathématiques

« Most of the world’s mathematicians fall into just 24 scientific ’families’, one of which dates back to the fifteenth century. The insight comes from an analysis of the Mathematics Genealogy Project (MGP), which aims to connect all mathematicians, living and dead, into family trees on the basis of teacher–pupil lineages, in particular who an individual’s doctoral adviser was. »

Source : "Majority of mathematicians hail from just 24 scientific ‘families’" http://www.nature.com/news/majority-of-mathematicians-hail-from-just-24-scientific-families-1.20491