Mr Mercer is a career officer with the Department of Foreign Affairs and Trade (DFAT). Prior to taking up his role as High Commissioner to Brunei Darussalam, Mr Mercer was Counsellor and Deputy Head of Mission, Australian Embassy, Mexico. Prior to this, he was Director, WTO Regional and Free Trade Agreements Section. Mr Mercer has served overseas as Deputy Head of Mission, Australian Embassy, Chile and Second Secretary, Australian Embassy, Mexico.
Mr Mercer holds a Master of International Studies from the University of Sydney, a Bachelor of Arts from the University of Western Sydney, and a Graduate Diploma of Arts from Monash University.