[1] He has composed music for such TV series as Buffy the Vampire Slayer and Castle; as well as films such as Butterfly on a Wheel and Into the Blue 2: The Reef.
[2] As a child he attended the Claude Watson School of the Performing Arts and in sixth grade he composed his first piece of music.
[3] As an extra curricular activity, Duncan studied the pipe organ and trumpet[3] before later earning a bachelor's degree in music at York University.
[2] After graduating, Duncan spent the next 5 years apprenticing with two Canadian composers[4] and participated in the ASCAP Film Scoring Workshop.
[2] Landing many small screen projects including The Chicago Code, Terriers, The Gates, Lie to Me, The Unit, Point Pleasant, Tru Calling, and S.W.A.T.,[5] he is best known for his work on Castle.