De Halleux was actively involved in oecumenical dialogue, was appointed a consultor to the Pontifical Secretariat for Christian Unity in 1974, and took part in the Vienna 'Pro Oriente' colloquia.
André Previn | André Breton | Andre Agassi | André Malraux | André Derain | Victor André Cornil | Carl Andre | Andre Ward | Fabrizio De André | André the Giant | André Heller | André Gide | André-Gaston Prételat | André | Andre Norton | André Masséna | André Guignard | André Franquin | Andre Begemann | Peter Andre | Andre Williams | Andre Ware | André Leon Talley | André Le Nôtre | André Glucksmann | André Charlot | André Sogliuzzo | André Marie Constant Duméril | André-Jacques Garnerin | André Bauer |