How do urban planners go about their work and what contributions do they make to the building of liveable cities? Ke Huanzhang, former head of the Beijing Academy of Urban Planning and Design, is all for the seamless melding of a good ecological environment, living facilities, jobs and public services in a city. Liu Thai Ker, the former chief architect and CEO of Singapore’s Housing Development Board, says a good planner needs to have the heart of a humanist, the brain of a scientist, and the eye of an artist. Tan Ying Zhen speaks to the veteran urban planners as part of a series of fireside chats put together to commemorate the 30th anniversary of diplomatic relations between Singapore and China.