Tan Sri Ambrin Buang has served 11 years as Malaysia's Auditor-General following his retirement as a PTD officer (administrative and diplomatic service) in March 2006. As a PTD officer he has served in various capacities in the public service for 35 years beginning April 1971 as an Assistant Secretary, Ministry of Commerce and Industry. He retired as the Secretary-General of the Ministry of Education. He was involved in the audit of several high - profile cases during his AG Days such as 1MDB, PKFZ and National Feedlot Corporation.