In October 2001 , he defended his Ph.D. in Psychology at the Free University of Brussels on the theme of the 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 Oktober 2001, beliau mempertahankan Ph.D. dalam Psikologi di Free University of Brussels mengenai tema 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.