Jeffrey Siow

Political career On 2 April 2025, Siow retired from his positions at MOM and MTI. He was the most senior of civil servants to resign ahead of the upcoming general election that year.

Siow was revealed to have joined the People's Action Party (PAP) team contesting Chua Chu Kang Group Representation Constituency (GRC), alongside Deputy Prime Minister Gan Kim Yong, incumbent Member of Parliament (MP) Zhulkarnain Abdul Rahim and neuroscientist Choo Pei Ling. He said to The Business Times that he viewed politics as "an extension of public service", Henceforth Siow contested Chua Chu Kang GRC with Tan, Zhulkarnain, and Choo, with the team winning the election with 63.59% of the votes and a majority of 23,512 against the Progress Singapore Party.

On 21 May 2025, Siow was appointed as acting Minister for Transport and Senior Minister of State for Finance in the Second Lawrence Wong Cabinet. He succeeded Chee Hong Tat who became Minister for National Development in the former role. On 22 July 2026, prime minister Lawrence Wong announced that Siow would be appointed Minister for Transport and Second Minister for Finance, effective from 27 July 2026.

Personal life Siow is married and has a son and a younger daughter who were born two years apart. He is a football enthusiast and plays the sport during his free time on weekends. He is also interested in science fiction, listing The Three-Body Problem and authors including Isaac Asimov and Ted Chiang as among his favourites in the genre.