He also played with Arturo Benedetti Michelangeli, Isaac Stern, Henryk Szeryng, Jean-Pierre Rampal, Mstislav Rostropovich, Galina Vishnevskaya, Aldo Ciccolini, Paul Badura-Skoda, and Pierre Barbizet.
In 1978, Wallez created the chamber orchestra Ensemble orchestral de Paris which toured Europe, South America, and Japan.
His repertoire includes operas by Mozart, Rossini, Bizet, Berlioz, Gounod, Britten, Offenbach.
He teaches violin at the Conservatoire Supérieur de Musique in Geneva (virtuosity class) and tutors children aged 3 to 7 through the association he created, la Maison Internationale du Violon.
[2] Wallez is Chevalier de la Légion d'honneur,[3] Officier dans l'Ordre national du Mérite,[4] Officier des Arts et Lettres, and received the Médaille de Vermeil (bronze) from the City of Paris.