In his early years, Ker was educated at Xing Hua Primary School.
In 1966, Ker graduated with a Bachelor of Commerce from the then Nanyang University, Singapore.
In 1968, Ker obtained his master"s degree in Economics from the University of Manitoba, Canada.
In 1972, Ker obtained his Doctor of Philosophy in Economics from the University of Manitoba, Canada.
He was Minister of State (September-December 1991) and later Minister of State for (January 1992) and Information and the Arts (January 1992-August 1994). He joined Liang Court in 1980 and later became the Managing Director (1991). He was Chairman of Superior Metal Printing Limited (1990-1992, September 1994-1995).
Deputy Chairman of the Chinese Development Assistance Council (September 1994-2000).
Chairman of the Aljunied Town Council (February 1995) and the Government Parliamentary Committees for Home Affairs and Law (August 1995-1996). And Director of the Singapore Trade Office in Taipei (2002-2004).
From 1994 to 2001, he was Managing Director of Yenom Holdings Pte Limited. Both Liang Court and Yenom Holdings belonged to billionaire Goh Cheng Liang.
On 1 March 2001, he was elected as an Independent Director to the Board of Tung Lok Group.
From October 2002 to June 2007, he was appointed Trade Representative in the Singapore Trade Office in Taipei. From July to December 2007, Ker was the Special Adviser to Minister for Foreign Affairs. In January 2008, Doctor Ker assumed his current post as Consul-General in Hong Kong and Macao.
As of June 2015, Ker is Adjunct Professor at Lee Kuan Yew School of Public Policy, National University of Singapore.
