Throughout his career, Ng has held a number of leadership and advisory roles in Singapore's business community. He served as President of the Automobile Association of Singapore from 1988 to 1996. In 1992, he became a faculty fellow of Business Administration in the School of Postgraduate Management Studies at the National University of Singapore. The next year, he became a member of the Trade Development Board of the China Business Information Advisory Group as well as a member of the Advisory Board of the Entrepreneurship Development Center at Nanyang Technological University.