 Agache earned PhD in art history and archeology.His doctoral thesis was "Atlas d'Archéologie aérienne de Picardie, 1975; La Somme préromaine et romaine, d'après les prospections aériennes à basse altitude" (The Pre-Roman and Roman Somme, Based on Low-Altitude Aerial Prospecting), completed in 1978.Agache studied Paleolithic and Neolithic and then directed its research toward aerial archaeology in northern France, beginning in 1959.