Dr Sarah Hill, the CEO of the Western Parkland City Authority, talks about delivering her vision for 'a metropolis of three cities’', a vision she co-created as the inaugural CEO of the Greater Sydney Commission, to fundamentally change the way we think and plan for Greater Sydney.Sarah talks about leading the Commission to develop new ways of engaging with citizens, to measure and monitor key planning outcomes and to better align growth with infrastructure through new methods such as Australia’s first Place-Based Infrastructure Compact.