The study of woodworking and violin leads André Theunis in 1972 at Mittenwald violin school in Bavaria.
He graduated in 1976, followed by a fellowship with the luthier Bengt Nilsson in Sweden.
He completed his training in the house "W.E. Hill & Sons "in England.
He has been living in Brussels since 1980, where he is dedicated to the making, the restoration and tuning of the quartet's instruments.