Hamizah holds a Bachelor of Law (Hons) (First Class Honours) from the International Islamic University of Malaysia in 1993 and was called to the Malaysian Bar as an Advocate & Solicitor in 1994. She is licenced by the Companies Commission of Malaysia since December 1998. Hamizah spent the early years of her career in legal practice before joining TM as an Assistant Company Secretary in 1996. She was appointed as Joint Secretary on 15 July 2011 and thereafter as General Manager of Company Secretarial Unit of Group Legal, Compliance and Company Secretarial Division in 2012. She was subsequently named as the Group Company Secretary on 1 January 2017, heading the Group Company Secretarial Division of TM. She left TM on 31 December 2019 and rejoins on 1 September 2020. Hamizah brings with her 25 years of experience on corporate secretarial, compliance and corporate governance matters as well as due diligence exercises and special projects.