Duncan grew up in Goulburn, NSW. After moving to Canberra for high school, he completed a Bachelor of Laws/Arts (Theatre Studies/Film Studies) at ANU, taught improvisation classes in schools across ACT and Victoria, made short films, hosted a radio show, co-ordinated the University Theatre Society and directed a successful season of Zara and the Sea at the Drama Centre.
During his time in Canberra, Duncan had the opportunity to hone his craft, performing as Kenny in The Removalists (CAT award nomination for Best Actor), Creon in Antigone, Henry in Henry IV and Don Perlimplin in Lorca’s play of the same name.
After fulfilling a dream to play club cricket for seven months in the Netherlands, Duncan hitchhiked through Central and South America for several months before returning home to graduate and commence work at the High Court of Australia. Soon after he applied to NIDA. Since moving to Sydney, Duncan has spent time outside of NIDA writing and directing new plays, including The Corinthian and Galle at the NIDA Student Festival, shooting short films and busking in Sydney streets.