Cary grew up in Camberwell, South London. He graduated from the Royal Academy of Dramatic Art in 2006 with a BA(Hons) in Acting.

In 2020 he won Best Male performance in a leading role at the Off West End Awards for playing Jamie in Country Music by Simon Stephens. He was nominated twice for the same award, for his roles as Iago in Shakespeare's Othello and Mephistopheles in a one man reworking of Goethe's Faust.