John was born in 1967, in Glasgow, Scotland. His family moved to Joliet, Illinois when he was eight.
While studying at United States International University, he returned to the UK to study Shakespeare. While studying there, he attended an open casting call for Anything Goes
. They needed an actor who could not only act and sing, but also do an American accent. He got the role, and hasn't looked back since.
He has since appeared on stage both in the UK and the US, in shows including Miss Saigon
, Beauty and the Beast
, Sunset Boulevard
,and A Few Good Men
He has appeared on television on both sides of the Atlantic, most recently in the BBC revival of Doctor Who
and its 2006 spin off, Torchwood
. His film roles include DeLovely
, in which he performed a duet with Kevin Kline
and Mel Brook's remake of The Producers