Alphonsus is the Deputy Chief Executive Officer of International Enterprise Singapore, or IE Singapore (formerly known as the Trade Development Board). IE Singapore is responsible for developing Singapore as an international trading hub and for helping Singapore-based enterprises to grow and internationalise successfully. IE Singapore has presence in 36 locations worldwide.

Alphonsus oversees International Markets and Corporate Resources including Corporate Planning, Corporate Events and Resources, Infocomm and Security Management and Finance. Prior to joining IE Singapore, he held senior management positions in leading organisations, Singapore Airlines (1987-2000) and Reed Exhibitions (April 2001-May 2004).

With Reed Exhibitions, he was Chief Operating Officer (Asia Pacific South) and President China and actively involved in charting the strategic directions for Reed's offices in China and the region. He was also a key negotiator for the company's joint ventures and acquisitions.

With Singapore Airlines (SIA), he was Chief Executive of SilkAir and before that Vice-President (Market Planning). Alphonsus is also familiar with the nuts and bolts of managing overseas operations, having served as General Manager (Belgium & Luxembourg) and General Manager (France) from 1992 to 1996.

Alphonsus graduated from the National University of Singapore in 1982 and was a gold-medal winner of the NUS' inaugural APEX-MBA programme in 1998.