Joseph Bertony (4 March 1922 – 7 April 2019) was a French-born Australian engineer. Trained as a naval architect, he served in the French Navy during the Second World War and, after the Fall of France, as a spy for the French intelligence services. Bertony was captured twice by the Germans and imprisoned in concentration camps and successfully escaped both times. He was awarded the Croix de Guerre for his bravery and emigrated to Australia after the war. Bertony worked as a civil engineer and played a key role in designing the temporary works that allowed construction of the Sydney Opera House sails. This entailed making more than 30,000 manual calculations with an accuracy of 0.5 inches (1.3 cm). Subsequent computer checks showed that he had not made a single error. In later life he worke