In 1972 Paul Wild invented Interscan, a standard microwave landing system. From 1978 to 1985 he was chairman of the CSIRO, during which time he expanded the organisation's scope and directed its restructuring. He retired from the CSIRO to lead (from 1986) the Very Fast Train Joint Venture, a private sector project that sought to build a high-speed railway between Australia's two most populous cities. Lack of support from government brought it to an end in 1991. In his later years he worked on gravitational theory.