[2] Bellissard worked as a teaching assistant at the École catholique des arts et métiers (E.C.A.M.)
From 1969 to 1970 he taught at Lyon's Lycée La Martinière, an engineering preparatory school, and was simultaneously enrolled as a graduate student in theoretical physics at the Aix-Marseille University.
he worked with Alain Connes and started on a program of research on the noncommutative geometry of aperiodic solids.
Bellissard created the Group of Theoretical Physics at the Paul Sabatier University in Toulouse.
In 1994 he was an Invited Speaker at the International Congress of Mathematicians in Zürich with talk Noncommmutative geometry and the quantum Hall effect.