1. Masters of Business Administration (MBA) from New Hampshire College, United States of America
2. Bachelor of Economics (Honours) Degree in Public Administration from the University of Malaya

Tan Sri Sidek is currently the Chairman of Petroliam Nasional Berhad, Director of Malayan Flour Mills Berhad and Chairman of Malaysia Digital Economy Corporation Sdn. Bhd. 

Tan Sri Sidek began his career in the Administrative and Diplomatic Service on 15 April 1974 as an Assistant Director at the International Trade Division of Ministry of International Trade and Industry. He was later appointed as Assistant Trade Commissioner at the Malaysian Embassy in Tokyo, Japan, from May 1977 until July 1980. From August 1980 until 1985, he served in the Implementation Coordination Unit (ICU) of the Prime Ministers Department, initially as a Principal Assistant Director, then later promoted to Deputy Director, Project Analysis Sector and subsequently as the Deputy Director of Research in the same department.

Tan Sri Sidek has expansive working experience within the Ministry of International Trade and Industry. During his service in the ministry, he was Malaysias Trade Commissioner in Sydney, Australia, Deputy Director in the Policy and Research Division, Deputy Director (Operations) in the International Trade Division, Minister Counselor of Economic Affairs at the Embassy of Malaysia, Washington D.C., United States, and the Director of Multilateral Relations Division. He was appointed as Deputy Secretary-General (Trade) on 19 January 2001 and thereafter as the Secretary-General of the Ministry of International Trade and Industry on 24 October 2004. He was appointed as the 12th Chief Secretary to the Government of Malaysia by the Yang Di-Pertuan Agong on 3 September 2006 and was in the office until
23 June 2012.

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