Tan Sri Dato' Seri Mohd Khairul Adib bin Abd Rahman served as Director-General of the Public Service Department (PSD) from 1 October 2019 to 16 January 2022. Prior to that Tan Sri Dato' Seri, was the Deputy Secretary-General of the Ministry of Transports (MOT) from August 2017 before promoted to Secretary-General of the MOT in January 2019. 

Tan Sri Dato' Seri Mohd Khairul Adib began his career in January 1988 as an Assistant Director in the Ministry of Entrepreneur Development, Malaysia.  In October 1995, he was awarded the MONBUSHO Scholarship by the Japanese Government where he studied Public Policy. In October 1997, he became the Principal Assistant Director at the Ministry of Science, Technology and Environment (MOSTE), Malaysia before assuming the role of Counsellor at the Human Resource Department for the Embassy of Malaysia in Tokyo, Japan in August 2004. He then became the Counsellor (Training) at the Public Service Department (UK Office) for the High Commission of Malaysia, London, in June 2006. 

In August 2009, Tan Sri Dato' Seri Mohd Khairul Adib became the Head of Strategic Unit at the Ministry of Science, Technology and Innovation (MOSTI), Malaysia. He held the role of Undersecretary (Industry) for MOSTI from August 2011 until February 2014. He then became the Undersecretary (Policy and International Relations) for Ministry of Education (MOE), Malaysia until June 2017. During this period, Tan Sri Dato' Seri Mohd Khairul Adib was also the Secretary General National Commission for UNESCO Malaysia and the National Point of Contact for ISESCO Malaysia. 

In January 2022, Tan Sri Dato' Seri Mohd Khairul Adib was conferred the Japanese Decoration, The Order of the Rising Sun, Gold and Silver Star by the Emperor of Japan for his contributions on the Look East Policy through people-to-people exchange and cooperation on the field of transportation between Malaysia and Japan.

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