At this time at university, Joseph Deiss was also the chairman of the Board of Directors at Schumacher AG in Schmitten (FR) and chairman of the Raiffeisenbank in Haut-Lac, Courtepin (FR).
Pada saat di universitas, Joseph Deiss menjabat ketua Dewan Direksi di Schumacher AG di Schmitten (FR) dan ketua Raiffeisenbank di Haut-Lac, Courtepin (FR).