Duncan graduated from the University of Melbourne in 1994 with a degree in Veterinary Science. Upon graduation, he commenced work in various practices in the Western District of Victoria. In 2001, Duncan and his family moved to the Maffra-Sale practice. Since that time he completed a PhD in animal reproduction at the University of Melbourne while in clinical practice and published scientific papers on research performed in the Maffra-Sale area.
Duncan now concentrates on clinical work and has further developed his skills in animal surgery in household pets, racing greyhounds and horses.