Mathematical Physics when I was a member of "Centre de Physique Théorique de Marseille" which was a laboratory of "Centre National de Recherche Scientifique", during 1960's and 1970's.
Biomechanics, my first interest in medecine, during 1980's
Statistics with medical interest during 1980's in Marseille and
1990's in Guadeloupe, where I was the director of the "Groupe de Recherche en Statistisques et Mathématiques Appliquées" Université Antilles-Guyane,