Chronology of Thomas de Hartmann's life and major musical works

He survived the Second World War in France, composing quietly, almost in seclusion, five Concertos and his Second Symphony. After Gurdjieff's death in 1949, he prepared several volumes, privately distributed by Editions Janus in Paris, of the music he composed in collaboration with him. In 1951, he emigrated to America. There he finished his Opera Esther, opus 76, begun in 1946, and his second Piano Sonata, opus 82 (dedicated to PD Ouspensky's ideas of the Fourth Dimension). In 1955, Leopold Stokowski directed his 'Four Dances' from the opera Esther.
Thomas de Hartmann died of heart failure on the 26th of March, 1956 in Princeton, New Jersey. He had just started working on the chapter 'Music' in his autobiography and a concert of his work, with himself as a soloist, was scheduled in Town Hall, New York the next month.
His 90 opus numbers include several ballets, three operas, four symphonies, seven concertos, works for piano, chamber music, and many songs on texts by Balmont, Pushkin, Verlaine, Joyce, Proust, Shelley and Shakespeare. His work gradually evolved from a late Romantic towards a modern and personal style. However, he was a forgotten composer soon after his death and even Belaieff removed his compositions from their catalogue after 1960.