During his time at Yale, Liu formed close relationships with his professors. One of them introduced Liu to
I. M. Pei, who offered Liu a job at his firm. He eventually became HDB's CEO in 1979. Throughout his time in HDB, he had oversaw the development of 20 new towns and 500,000 residential units. In 1989, he moved to the
Urban Redevelopment Authority (URA) as its CEO and chief planner, where his contributions included the revision of its Concept Plan. In 1992, Liu left public service to join RSP Architects Planners & Engineers (RSP) as a director. During this time, he designed
Marina Bay Cruise Centre Singapore and the Chinese Cultural Centre. Through the next 40 years since his first commission in China, he had participated in 40 urban planning projects in China, and did city planning for more than fifty cities. Then Fuzhou party secretary
Xi Jinping, impressed by his city plan, approached him to design
Fuzhou Changle International Airport. Liu had advised various cities' authorities there to keep historic areas such as
Sanfang Qixiang in Fuzhou, a neighbourhood of historic shophouses on
Xiamen Island, and ordered clean ups for
Min River in Fujian and Yundang Lake in Xiamen on the basis that these locations would serve as great tourism attractions in the future. He served as the founding chairman of the Centre for Liveable Cities, a policy institute on urban development and environmental management established in 2008 by Singapore's National Development and the Environment and Water Resources ministries. In December 2017, at the age of 79, Liu left RSP to found Morrow Architects and Planners, named after his father's artistic studio. In 2024, Liu was working as an urban planning adviser to
Fiji as well as the Chinese provinces of
Sichuan and
Guangdong. == Personal life ==