[2][3] In 1969, Gall became an assistant to Rolf Liebermann,[6] and general secretary of the Réunion des théâtres lyriques nationaux [fr], an organisation to converge the Paris Opera, with its Palais Garnier venue, and the Opéra-Comique, playing at the Salle Favart.

He won Maurice Béjart to direct Mozart's Don Giovanni,[7] conducted by Horst Stein with Ruggero Raimondi in the title role in 1980,[8] and Salome by R. Strauss; Liebermann directed Wagner's Parsifal, and Robert Carsen first staged Boito's Mefistofele, to international recognition, and later Wagner's Lohengrin and Gounod's Faust.

[8] During Gall's tenure, conductors of the Orchestre de la Suisse Romande also included Armin Jordan and Christian Thielemann, and singers such as Gwyneth Jones, Katia Ricciarelli and Leonie Rysanek performed as guests.

[10] 60 ballets new to the company were given, including Signes, choreographed by Carolyn Carlson, Clavigo by Roland Petit, Casanova by Angelin Preljocaj, Nosferatu by Jean-Claude Gallotta [fr], and Wuthering Heights by Kader Belarbi.

[4][6] At the end of March 2008, Gall was appointed chairman of the committee responsible for filling the position of director of the Villa Medici in Rome.

[12] On 17 February 2010, Valéry Giscard d'Estaing announced Gall's participation in the commission for reflection on the future of the Hôtel de la Marine chaired by the former president of the Republic.