- Master of Business Administration, Henley Business School, University of Reading, United Kingdom
- Bachelor in Economics, University Malaya.

Tan Sri Datin Paduka Siti Sa'diah binti Sheikh Bakir ("Tan Sri") commenced her career with Johor Corporation (JCorp) in 1974 and has been directly involved in JCorp's Healthcare Division since 1978. Tan Sri was appointed as the Chief Executive of Kumpulan Perubatan (Johor) Sdn Bhd (KPJSB), from 1989 until the listing of KPJ in November 1994. 

Tan Sri is currently an Independent Non-Executive Director of KPJ Healthcare Berhad (KPJ), redesignated on 1 May 2015 from a Non-Independent Non-Executive Director of KPJ. Prior to that, Tan Sri was the Managing Director of KPJ from 1 March 1993 until retirement on 31 December 2012, and as KPJ's Corporate Advisor from 1 January 2013 until 31 December 2014. 

Tan Sri is currently the Chairman and Pro-Chancellor of KPJ Healthcare University College (KPJUC) since 1 August 2011 to date. 

Tan Sri served on the Board of Damansara REIT Managers Sdn Berhad - The Manager for Al-'Aqar Healthcare REIT and Al-Salam REIT, from 2006 until March 2016.

Tan Sri was a Board member of KFC (Holdings) Bhd and QSR Brands from 2010 until their privatisation in 2013. She was an Independent Non-Executive Director of Bursa Malaysia Berhad from 2004 to 2012 and a Board member of MATRADE from 1999 to 2010.

- KPJ Healthcare Berhad
- Chemical Company of Malaysia Berhad
- CCM Duopharma Biotech Berhad
- OSK Holdings Berhad

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