Nathan Charles Buckley (born 26 July 1972) is a former professional Australian rules football player, commentator and coach, best known for his time as captain of the Collingwood Football Club in the Australian Football League (AFL). He is currently the senior coach of the Collingwood Football Club. He is listed by journalist Mike Sheahan as one of the top 50 players of all time. Buckley won the inaugural Rising Star Award, in 1993, then went on to become one of the game's elite, captaining Collingwood between 1999 and 2007, winning the Norm Smith Medal for best player afield in the 2002 Grand Final despite playing in the losing team, only the third player in history to do so, the Brownlow Medal in 2003, winning Collingwood's Best and Fairest award, the Copeland Trophy, six times and named in the Collingwood Team of the Century.

After months of speculation, Buckley signed a 5-year deal with the Collingwood Football Club. He was the assistant coach for the seasons of 2010 and 2011; he then became head coach in 2012, having taken over from Mick Malthouse, initially signing for a period of three years.  Collingwood began the 2012 season shakily, losing to Hawthorn in round 1 and being thrashed by Carlton in round 3. However they recovered to win their next ten matches and finish the home-and-away season in fourth place with a record of 16-6. They were defeated by Hawthorn in the Qualifying Final before bouncing back to defeat West Coast in the Semi Final. However they lost comfortably to eventual premier Sydney in the Preliminary Final at ANZ Stadium to bring an end to the 2012 season.  2013 started poorly for the Magpies, slumping to a 5-4 record after 9 games. They couldn't quite find the consistency of previous seasons and finished the year in sixth place with a 14-8 record. They played Port Adelaide in their Elimination Final at the MCG and slumped to a shock 24-point loss, which caused Buckley to call into question the club's culture.  Buckley's contract was extended until the end of 2016 by Collingwood in early March 2014, however Collingwood produced a poor performance in round 1 and lost to 2013 grand finalists Fremantle by 70 points. They ended up missing the finals to finish 12th partly due to an injury crisis. Collingwood started the 2015 season at 3-1 as of Round 4 and a gutsy win against Essendon on Anzac Day in 100th centenary of Gallipoli landing.  At the end of Collingwood's 2017 season on 28 August 2017, Buckley was given a two-year contract extension by the club after it undertook a review of the entire football club.

Using a quote from the above article, answer the following question: When did he begin coaching?
Buckley signed a 5-year deal with the Collingwood Football Club. He was the assistant coach for the seasons of 2010 and 2011;