In addition to his roles in the university, he was Deputy Principal ACS International and Vice President in Mediacorp. He is an executive Master coach, Curriculum Developer with DACE certification and Master Trainer. Clients he has served include: NUS, NTU, MINDEF, NEA, People’s Association, Customs, IGE in Myanmar, Intel, SAP, Tourism Court, Public Utilities Board, Prudential Singapore, IAL; Training Vision; Buckman, NOV FGS, Avnet, Dusit Thani, Monetary Authority of Singapore and MOE Schools. His clients come from varied industries – oil and gas, trading, HR, utilities, insurance, IT and education internationally. Charles holds certifications in Leadership Best Practices from Harvard Business School and in Negotiations from MIT.