In 1999, Cronin began his acting career playing a High Priest in The Mummy.
He subsequently had small roles in The World Is Not Enough and Harry Potter and the Chamber of Secrets.
He also appeared as Max, one of the villainous Ferrino brothers (along with Bruce Payne as Ray), in The Antwerp Dolls.
[4][5] Cronin's first directorial film was Escape to Gossau, which he co-directed with Michael Koltes.
Cronin subsequently directed Give Them Wings, which focuses on the life of disabled writer Paul Hodgson.