Koh was director of Heeton Holdings until 2012 when he retired.[4]
Academic career
In 1972, Koh was appointed the dean of the College of Science of Nanyang University.[5] In 1978, Koh joined the People's Action Party (PAP) and was a member of the Estimates Committee of Parliament (from 1979 to 1990) and the Urban and Rural Service Committee (from 1979 to 1988).[3] He stated that before joining, he had previously been asked by the PAP to join in "1970 or 1972".[6]
In the late 1970s to 80s, Koh, along with several others, supported the merging of Nanyang University and the University of Singapore to form the National University of Singapore (NUS).[7][1]
In the 1991 Singaporean general election, Koh secured a second term as the MP representing the Nee Soon South Single Member Constituency by winning 52.9% of the vote against SDP's Low Yong Nguan.[14] In 1996, Koh complained that his branch's library had not been made since it was materialized 10 years ago, asking for a progress report on the Library 2000 project.[15]
He retired from politics in 1996 after being an MP since 1979.[16][17]