Duncan qualified in London as a primary school teacher in 1976. After teaching in Sheffield he returned to Suffolk where he worked in both rural and urban schools. From 1988 to 2001 he was headteacher at a village school on the outskirts of Ipswich, including a spell as an Ofsted inspector.
Duncan left teaching and joined Suffolk County Council Archaeological Service in 2001. Since then he has developed our educational provision to schools, including the infamous Garbology project in 2004 and an innovative scheme that introduced young people to archaeology through experimentation and reconstruction.
Duncan currently manages Hands On Heritage, an experimental site for visiting young people and adult volunteers. He also works closely with schools, developing learning through archaeology.