Most well known for his portrayal of Kraven in the Underworld movie series, he is also recognized for his major roles in several other horror films and thrillers, including Book of Fire (2014); Japan (2008); Devil's Highway (2005); and Deadly Swarm (2003). In addition, he starred as Henry in the short-lived television series ChromiumBlue.com.
At the start of his career, he appeared in two episodes of the HBO series Night Man.
A writer as well as an actor, he published poetry collections titled You'd Think There Would Be More Suicides Around Here (2003) and The Ossuary (2015) and also penned several plays and screenplays.
He spent his youth in Belfast, Northern Ireland, and later settled in Los Angeles, California, U.S.A., with his screen actress wife Sarah Buxton. In 2006, he and Buxton welcomed a son named Finn Michael Brolly.
He co-starred with Christine Taylor in the 2006 thriller Room 6.