She was born Hedwig Magdalena Simon in Vienna to Else Reis and Hans Simon, an eminent economist and banker. She was one of those whose life was deeply affected by the spread of virulent fascism in Europe in the 1930s. Both her parents were assimilated, non-observant Jews; her father had Hedi baptised to make sure that she would have protection from antisemitic shopkeepers during the starvation caused by the First World War. She was sent to a progressive school in Vienna founded by the Polish-JewishfeministEugenia Schwarzwald, at whose home Hedi met such figures as the painter Oskar Kokoschka and the architect Adolph Loos. When she was 14, as an atheist she elected under the Austrian Constitution to register as Konfessionslos. She studied philosophy at the University of Vienna. One of her lecturers, Professor Moritz Schlick was shot by a deranged student. The student was later paroled, acclaimed as a 'heroic Aryan' and, became a member of the Austrian Nazi party after the Anschluss. Incidents such as this caused Dr Simon to leave Vienna and take his family to Switzerland and later to the USA.
In Ceylon, the left had split in 1940, when the Trotskyists in the Lanka Sama Samaja Party expelled the pro-Moscow faction, which formed the United Socialist Party. The Keunemans joined the USP, which was fiercely anti-colonial until the invasion by Hitler of the Soviet Union, thereafter advocating co-operation with the colonial regime against the common enemy, fascism. Hedi Keuneman was elected president of one of the co-operative societies were formed to distribute affordable food, following the outbreak of war. She monitored food stocks and prices in central Colombo, popularising cheaper, local food cereals such as bajiri, a locally grown sticky grain, earning herself the nickname bajiri nona. Between 1940 and 1942, Hedi Keuneman taught at University College, Colombo and at the Modern School initiated by another communist emigrant and India League veteran, Doreen Young Wickremasinghe. She was active in the Friends of the Soviet Union and, with shoulder-length black hair and sometimes barefoot in a red sari, distributed pro-communist literature and addressed meetings among English-speaking supporters. She also wrote a pamphlet publicising Hitler's tyranny, Under Nazi Rule. In 1943 when the USP was dissolved and became the Communist Party of Ceylon, Pieter became its first general secretary. He and Hedi subsisted on boiled breadfruit and sambol, living modestly near the CP office in Borella.
London
Following end of the war in 1945, Hedi Keuneman returned to Europe to meet her mother—as a communist, she was barred from entering the United States. In London in 1946 she met an old friend from Vienna, Peter Stadlen a distinguished concert pianist who had premiered the WebernOpus 27 Variations. She chose not to return to Ceylon, and divorced Pieter. While Hedi Stadlen never rejoined a communist party, she never renounced her socialist convictions. She subsequently married Stadlen, with whom she lived in Hampstead. In 1956, a hand injury obliged Stadlen to turn to music criticism, chiefly for The Daily Telegraph, and academic study. Hedi collaborated with him, possibly influenced by her musical heritage, as grandniece of Johann Strauss. They produced conclusive evidence that extensive sections of Anton Schindler's Beethoven conversation books were forgeries. She also played a crucial role in Stadlen's study of Beethoven's intentions with his metronome markings. On Stadlen's death on 20 January 1996, Hedi lied about her age and joined the charity Volunteer Reading Help, and for six years helped disadvantaged children in a North London primary school to strengthen their reading. She also worked with Annette Morreau on a biography of the Viennese cellist Emmanuel Feuermann. In 2002 she returned to Cambridge to receive the degree denied to her over five decades previously. At the same ceremony her son Nicholas received his M.A. and her grandson, Matthew, was awarded his B.A. Hedi Stadlen was survived by her sons Nicholas, a High Court judge, and Godfrey, a senior civil servant in the Home Office.
