In 1955, Jek's foray into politics began when he assisted the People's Action Party (PAP) during the 1955 general election.

That same year, due to his communist beliefs, he was detained under the Internal Security Act by Lim Yew Hock's government.

[6] Together with Lee Khoon Choy, Jek was appointed as the government representatives on the Joint-Government-University Liaison Committee in 1960 to reform Nanyang University.

[7] One of his final major public appearances was at the National Day Parade of 2015 in remembrance of Lee Kuan Yew.

[9][10] Prime Minister Lee Hsien Loong, President Halimah Yacob and many other political figures in Singapore offered their condolences to Jek's family.