Lecturer at the University Charles de Gaulle – Lille III, he was the first member of the SFDAS in 1967 before becoming director between 1975 and 1984 and from 2000 to 2004. He succeeded Jean Vercoutter as director of the Sai Island Archaeological Mission from 1993 to 2005 and was also the editor of the journal Archéologie du Nil Moyen.
His researches mainly concerned recent prehistory of the Nile Valley and namely the excavation of the site of El-Kadada.

 2006 “Saï 2000-2002”, ANM 10, p. 87-134.
 2004 “Funerary culture”, in D. Welsby et J. R. Anderson (éds), Sudan Ancient Treasures, London, p. 274-307.
 2004 “Neolithic Nomads at el Multaga, Upper Nubia, Sudan”, with Y. Lecointe, D. Peressinoto, R. Pouriel, A. Schmitt, Antiquity vol. 78, p. 54-60.
 2003 F. Geus and Y. Lecointe, “Survey and excavation at El Multaga, a ressetlement area related to the construction of the Merowe dam: preliminary results”, Sudan & Nubia 6, London, p. 33-39.
 2003 “Two seasons in Saï Island (1996-1997)”, Kush 18, 2003, p. 61-79.
 2002 “Saï 1998-1999”, ANM 9, p. 95-134.