1. Auditor, Price Waterhouse in Singapore (1990-1991).
2. Regional Accountant/Auditor, Mobil Asia Pacific Pte Ltd in Singapore (1991-1993).
3. Credit and Administration Manager, Mobil Polymers Asia Ltd in Hong Kong (1994).
4. Finance Manager - China Ventures, Mobil Oil Hong Kong - China Ventures Group, China (1995).
5. Finance and Admin Manager - Asia/Pacific, Mobil Polymers Asia Ltd (1996).
6. Finance Director - Asia Pacific, Future Electronics Inc (July 1997-August 1998).
7. Regional Accounting and Internal Controls Manager, General Motors Asia Pacific Pte Ltd (September 1998-September 1999).
8. Chief Financial Officer ("CFO"), Frontline Technologies Corporation Ltd, Asia Pacific (October 1999-May 2003).
9. Managing Director - Europe, Behringer Corporation Limited (November 2003-October 2004).
10. Group CFO, Behringer Corporation Limited (May 2003-March 2006).
11. Finance Lead - Supply East (Project based), Shell Eastern Petroleum (April 2006-July 2006).
12. Vice President ("VP") - ASEAN, Lear Corporation (April 2012-May 2013).
13. VP- Finance Asia Pacific Operations, Lear Corporation (August 2006-December 2013).
14. Senior VP and CFO, STATS ChipPAC (April 2014-July 2015).
15. CFO, StarHub Ltd (July 2015-September 2024).
16. Advisor to CEO, Starhub Ltd (September 2024-December 2024)

Dennis will relinquish his position in StarHub Ltd prior to assuming as the CFO of CelcomDigi Berhad.

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