Danion moved to Paris in 1924. After studying the violin, he played in a Paris orchestra. In 1945, he married Anik Gonzalez, daughter of Fernand Gonzalez and granddaughter of Victor Gonzalez, both renowned organ builders. In 1947, Victor Gonzalez invited Danion to work with him and replace his son Fernand who had died during the war in 1940. Having a passion for technical harmonization, he learned fast with the master. After the death of Victor Gonzalez in 1956, he became head of the Gonzalez company, henceforth commonly referred to as Danion-Gonzalez. Danion continued the neoclassical ideal of his master. The concept of neo-classical organ is a synthesis of the previous aesthetics, many quarrels and polemics within the world of organ making arose on the part of those who refused any developments in the organ-making tradition, including neo-baroque musicians. In 1962, he bought the Jacquot-Lavergne-Rambervillers company in the Vosges, then the oldest manufacturer of organs in the world still in operation since 1750. In 1963, he moved the company to Rambervillers. The premises included a large assembly room, joinery workshops and casting of tin where the entire metal pipe for the new organs could be manufactured. Today the company is led by Bernard Dargassies under the name of "Manufacture Vosgienne de Grandes Orgues". In January 1980, he founded with his wife, the "Manufacture Languedocienne de Grandes Orgues", in Lodève, Hérault. In 1988, the Gonzalez-Danion sold their Rambervillers company and settled in Lodève where they worked on the construction or reconstruction of the organs of St. Esteve in Andorra-la-Vielle, St. Vincent of Carcassonne, St. Paul of Clermont-L'Hérault, the restoration of instruments in the cathedrals of Béziers and Carcassonne, Lodève, the churches Our Lady ofLa Ciotat, St Peter's Prades, Prats-de-Mollo-la-Preste, as well as the reconstruction of the organ in the Church of St. Sauveur Aix-en-Provence and restored those of St. Peter's in Ceret and Ste-Bernadette Montpellier. Since Danion retirement in 1998, the company has been managed by organ builder and harmonist Charles Emmanuel Sarélot. In February 1992, George Danion was invited by the University of Denton, Texas to give a conference on organ building at a gathering of some two hundred organists, with Marie-Claire Alain, Marie-Madeleine Duruflé, Marie-Louise Langlais, and Jacqueline Marchal. In the preface to the inauguration program of the Meaux Cathedral organ rebuilt by Danion in 1980, Olivier Messiaen honored his art:
