Accomplished TV actor known for his role as the lead character Richard Castle on the ABC TV show Castle. He also starred as Mal on the sci-fi series Firefly and in its 2005 film sequel Serenity. In 2013, he appeared as Hermes in the film Percy Jackson: Sea of Monsters.
His first major role was as Joey Buchanan on the soap opera One Life to Live.
He had a small part in the award-winning film Saving Private Ryan.
He starred on the television series Firefly alongside Alan Tudyk.