Ms Chua, 55, was appointed Group CEO on 1 April 2007. She is responsible for Singtel’s three key businesses – Group Consumer, Group Digital L!fe and Group Enterprise.

Ms Chua joined Singtel in June 1989 as Treasurer and was made CFO in April 1999. She held the positions of Group CFO and CEO, International from February 2006 to October 2006, when she was appointed Deputy Group CEO.

Ms Chua sits on the Boards of Bharti Airtel Limited, Bharti Telecom Limited and key subsidiaries of the Singtel Group. She is also a member of the Singapore Management University Board of Trustees and the Public Service Commission.

Ms Chua holds a Bachelor of Accountancy (First Class Honours) from the University of Singapore. She is a Fellow Member of the Institute of Certified Public Accountants of Singapore and a CFA charterholder.

Mr Chang, 46, was appointed CEO, Group Enterprise on 16 July 2012. He is responsible for providing ICT solutions to serve the Group’s enterprise customers, offering innovative and comprehensive IT and telecommunications solutions across multiple geographies.

Mr Chang was previously Managing Director, Business Group, and joined Singtel in 2005 as Executive Vice President of Corporate Business. Before joining Singtel, he was the Managing Director of Cisco Systems' Advanced Services Group in Asia Pacific. His earlier career included roles at various multinational technology companies.

Mr Chang is the Chairman of the Singapore Polytechnic Board of Governors and a Board member of Singapore Post, serving in their Compensation and Technology Committees.

Mr Chang graduated with a Bachelor of Engineering (Honours) in Electrical and Computer Systems Engineering from Monash University, Australia.

Mr Lew, 57, is CEO, Group Digital L!fe and responsible for transforming the Group into a leading player in the digital ecosystem, shaping how people connect and discover innovative and cutting-edge digital services. As Country Chief Officer Singapore, he is the principal liaison with local and regulatory bodies. He assumed these positions on 1 April 2012.

Mr Lew began his career with the Singtel Group in November 1980 and has served in various senior management positions, including Chief Operating Officer of Advanced Info Service Public Company Limited (AIS) – the Group’s associate in Thailand, Chief Operating Officer of Singapore Telecom International Pte Ltd and Managing Director of Optus Consumer. He was CEO, Singapore from February 2006 to March 2012.

Mr Lew is the Chairman of the AIS Executive Committee and a Board member of the Sentosa Development Corporation.

He holds a Bachelor of Electrical Engineering from the University of Western Australia and a Master of Science (Management) from the Massachusetts Institute of Technology, US.

Ms Low, 52, was appointed Group CFO in September 2008. She oversees the Group’s financial affairs, including corporate finance, treasury, risk management and capital management and investor relations.

Ms Low joined Singtel in 1998 as the Group Financial Controller. In 2004, she was promoted to Executive Vice President of Strategic Investments managing the Group’s international investments and was appointed CFO of Optus in 2006. Prior to Singtel, Ms Low worked in the Singapore and London practices of an international accounting firm and thereafter at a public listed electronics company in Singapore.

Ms Low is a Director of Advanced Info Service Public Company Limited and a Council Member of the Singapore Institute of Certified Public Accountants. She is also a member of the Governing Board of the Lee Kong Chian School of Medicine.

She holds an Honours Degree in Accountancy from the National University of Singapore and is a Certified Public Accountant in Singapore.

Mr O'Sullivan, 52, was appointed CEO, Group Consumer on 1 April 2012. He is responsible for the Consumer businesses across the Group which include the wholly owned operations in Singapore and Australia as well as Singtel's investments in Advanced Info Service Public Company Limited, Bharti Airtel Limited, Globe Telecom, Inc., Pacific Bangladesh Telecom Limited and PT Telekomunikasi Selular (Telkomsel).

Mr O'Sullivan was CEO of Optus from September 2004 to March 2012. Prior to that, he held management positions within Optus including Chief Operating Officer and Managing Director of Optus Mobile. He has also worked in various international management roles at the Colonial Group and the Royal Dutch Shell Group in Canada, the Middle East, Australia and the United Kingdom.

Mr O'Sullivan serves on the Board of Commissioners of Telkomsel. He holds a Bachelor of Arts (Mod) Economics from Trinity College, University of Dublin and is a graduate of the Advanced Management Program of Harvard University, US.

Ms Tan, 46, joined Singtel in June 2008 as Group Director Human Resources. She oversees the development of human resources across the Singtel Group, and also leads the Group’s corporate sustainability function.

Prior to joining Singtel, Ms Tan was Group General Manager Human Resources at WBL Corporation Limited and Vice President, Centers of Excellence with Abacus International Pte Ltd. Her earlier career comprised human resources roles in multinational corporations and Singapore companies across various industries.

Ms Tan is a member of the Home Nursing Foundation Board and the Singapore Workforce Development Agency’s Human Resource Workforce Skills Qualifications (WSQ) Manpower, Skills and Training Council.

She graduated with a Bachelor of Arts majoring in Statistics and Japanese Studies from the National University of Singapore. She also holds a Master of Science in Organisational Behaviour from the California School of Professional Psychology, Alliant International University, US.

Ms Wu, 48, joined Singtel as Group CIO in August 2012 and is responsible for the development of the Singtel Group's IT vision and roadmap. She also drives synergies to establish excellence in technology management.

Before joining Singtel, Ms Wu was the Group CIO of Neptune Orient Lines Group from 2006. She served as the Singapore Government’s Chief Information Officer from January 2000 to June 2006, after holding a range of IT management roles in the Singapore Civil Service where she started her career.

Ms Wu is the Deputy Chairman of IDA International Pte Ltd, a wholly owned subsidiary of the Infocomm Development Authority of Singapore. Ms Wu also serves on the Management Board of the Institute of Systems Science, National University of Singapore.

She holds a Bachelor of Science (Honours with Highest Distinction) in Computer/Communication Science and Mathematics, and a Master of Science in Computer Science/Engineering, both from the University of Michigan, US.