Carson was born in Twynholm on 18 October 1967.[3] He attended Twynholm Primary School and later Kirkcudbright Academy. Carson then went to study at the University of Aberdeen where he graduated with a BSc Agriculture. Carson and his brother ran an IT business together. Carson lives with wife Jackie and has 4 children.[citation needed]
In 2016 he stood for the Scottish Parliament in Galloway and West Dumfries, in place of the retiring Conservative MSP Alex Fergusson.[3] He successfully held the seat for the Conservatives and had a majority of 1,514 votes (4.5%) over his SNP rival Aileen McLeod with a swing of 0.8% from the SNP to the Conservatives.[6]
Carson is the convener of the Scottish Parliament's Rural Affairs and Islands Committee.[7]
At the 2021 Scottish Parliament election Carson was re-elected as MSP for Galloway and West Dumfries with an increased majority of 2,635 votes over the SNP's Emma Harper who finished in second place.[8] Carson said he was "absolutely delighted" his vote share increased and while he thought "Indyref2 played some part in some people’s votes" he attributed his victory it to people supporting his position of challenging the Scottish Government on issues relating to "investment in the south-west and particularly in the west of the region in Stranraer".[9]
