In October 2001 he defended his doctorate in psychology at the Free University of Brussels on the subject of human models of cognitive hypertext navigation . He defended his Ph.D. in Psychology from the Free University of Brussels in October 2001 on the subject of human models of cognitive hypertext navigation .
Pada bulan Oktober 2001 beliau mempertahankan kedoktorannya dalam bidang psikologi di Free University of Brussels mengenai subjek model manusia navigasi hiperteks kognitif. Beliau mempertahankan Ph.D. dalam Psikologi dari Free University of Brussels pada Oktober 2001 mengenai subjek model manusia navigasi hiperteks kognitif.