Right back, Jason Thomson was loaned from Hearts to Dunfermline for six months from 8th July 2011. The 24 year old joined the Hearts Academy from Loanhead Boys Club and signed a full professional contract in July 2003. When faced with a flu epidemic, Hearts' head coach John Robertson called upon Jason to make his competitive debut in March 2005 against Inverness Caley Thistle and was rewarded with two further first team appearances that season. The former U19 internationalist also gained valuable experience on loan to Livingston for most of season 2006-07 when was reunited with John Robertson.
Under Stephen Frail towards the end of the 07/08 season Jason played the final 5 games of Hearts season. This meant upon Csaba Laszlo's arrival Jason was a part of the first team squad. He went on to start the season at right back in Robbie Neilson's absence and played a squad part for much of the season covering when either Neilson or Lee Wallace were out.
He signed a new 3 year deal in April 2009. Jason returned to the first team with a start against local rivals Hibs on November 7, 2009 replacing Craig Thomson (no relation) in the starting line up and was voted the match sponsors man of the match. Darren Barr's arrival in the summer of 2010 has created tough competition in the right-back position.
He made 14 appearances and scored one goal at Kilmarnock before returning to Hearts. Went on to join Raith Rovers.