Career
He was ordained a priest as well as incardinated in Chur on 7 April 1974. At the request of the bishop of Chur Johannes Vonderach, Haas was appointed to the position of coadjutor bishop of Chur on 25 March 1988. On 22 May 1990 Haas then became bishop of Chur.
On 2 December 1997 Pope John Paul II appointed him to archbishop of the newly created Archdiocese of Vaduz.
Haas is known for his friendly relations with and his support for the Priestly Fraternity of Saint Peter.