He is currently a senior director of RSP Architects Planners & Engineers (Pte) Ltd., a consultancy firm which he joined in 1992. RSP is a multi-national firm with offices in 16 cities and projects in 22 countries. In addition to architecture projects in Singapore, Mr Liu has also been invited to provide both architecture and urban planning services in around 40 cities outside Singapore. Among these city planning projects, the sizes range from a few hundred thousand people to 12 million people. As an architect, Mr Liu has also been involved in many prestigious projects both inside Singapore and in overseas cities. He has been concurrently the founding chairman of the advisory board of Centre for Liveable Cities, since 2008. The Centre for Liveable Cities is a knowledge hub created under the Ministry of National Development and the Ministry of the Environment and Water Resources, focusing on urban development related issues.