Mr Bunten grew up in Cornwall and Gloucestershire. He studied Physics as an undergraduate and postgraduate at the University of Oxford.
In 1984, he joined the British Foreign and Commonwealth Office and began a successful career as a diplomat, undertaking postings in New York, Taiwan and Canberra. He met Her Excellency the Governor, then an Australian diplomat, while they were both posted in Hong Kong.
In 2009 Mr Bunten left the FCO and, after completing a Graduate Diploma in Secondary Education at the University of Canberra, commenced a second career as a secondary school teacher of physics and mathematics.
For the next decade he taught at Melba Copland Secondary School, pausing from 2012-2015 when he accompanied Her Excellency to China, where she was Australian Ambassador.
Mr Bunten has also been a tutor to students at the Australian Defence Force Academy and Canberra University.
Mr Bunten is father to four adult children.