Following Berg’s death the most pressing problem was the completion of the opera Lulu. Universal Edition contracted with Arnold Schoenberg to complete the work but Schoenberg subsequently declined. The opera was premiered in a two-act version in Zurich in 1937. Helene Berg’s involvement with anthroposophy shaped her contention that Berg was still in communication with her and that Lulu’s third act should never be completed. Universal Edition commissioned the completion by Friedrich Cerha, and the premiere of the three-act version was held in Paris in 1979, after Helene Berg’s death. Helene Berg undertook a publication of her husband’s letters to herself, created the Alban Berg Foundation, and donated Berg’s manuscripts and papers to the Austrian National Library. Helene Berg died in 1976. Biographies of Berg were first written by his friends and students, including Willi Reich and Soma Morgernstern, later by those outside of his circle such as Hans F. Redlich.