Mr Mah Bow Tan used to work for the Singapore Bus Services. His effort within that career was recognised. Hence, he succeeded in combing up the ranks till he became the General Manager for Singapore Bus Services. He shifted his career to Singapore Press Holdings whereby he was appointed General Manager once again.
Mr Mah Bow Tan began to transform into a dedicated politician who served People's Action Party and representing the Tampines GRC since 1988. He is still a Member of Parliament. He used to be a member of the Cabinet in the mid 1990s to 2001. He was appointed the Minister of Comunications till 1999 and Minister for the Environment till 1995. He was also a Minister for National Development recently.