Career
Rangers
Leven was a youth player with Rangers and as a 16-year-old appeared on the bench four times for the first team, including an Old Firm match. A year later he suffered a serious knee injury in a pre-season game, which ruled him out for two years. Kilmarnock
Leven signed for Kilmarnock in 2004, but struggled to establish himself in the first team
He played just 65 times for Kilmarnock and at the end of the 2006-2007 season he rejected Kilmarnock"s contract offer in favour of first-team football.
Chesterfield
Leven joined Chesterfield on a free transfer in 2007. As Aaron Downes made a poor start to the 2007-2008 season, Leven was given the captaincy of League Two side Chesterfield.
He appeared in 44 of their 49 games in the 2007-2008 season. The club turned down numerous offers from Brighton up to £125,000 in the January transfer window.
Chesterfield then failed to gain promotion and he turned down a contract extension.
Milton Keynes Dons
Leven joined Milton Keynes Dons in June 2008 on a free transfer. At the end of his contract at the Dons, Leven declined to accept the contract extension the club offered him and he left as a free agent. Oxford United
There was interest in Leven from several clubs, including Millwall and Crystal Palace, but in July 2011 he signed a two-year deal with League Two side Oxford United.
On 29 October 2011 during a home game against Portuguese Vale, with the game at 1–1, Leven intercepted the ball inside his own half and lobbed the opposition keeper from the halfway line, which turned out to be the winning goal and one of the best ever goals scored at the Kassam Stadium.
While a free agent Leven was linked with Paul Ince"s Blackpool. In August 2014 Leven signed for Jarrow Roofing Bank Central Asia.
Leven was appointed to a coaching position at Kilmarnock in June 2015 joining the club as assistant manager.