Career
Boswell was raised in Coatbridge and worked there for a brief time as a policeman. Boswell then found work in the oil industry, as a quantity surveyor and contracts engineer He spent more than a decade in the oil and gas industry, with work taking him to Hong Kong, Egypt and the Falklands.
In December 2015 Boswell was criticised for having previously received an £18,000 interest-free loan from United States energy company Phillips 66 while working for them as a contracts manager.
Earlier in 2015, Boswell had tabled a motion in the House of Commons, calling for Chancellor George Osborne to close the "Mayfair tax loophole" tax avoidance scheme. An Scottish National Party spokesperson stated that Boswell had always declared his interests, and was committed to ending tax avoidance schemes.
In January 2016 it was announced that Boswell would be investigated by the Parliamentary Commissioner for Standards over the claim that he did not properly record his directorship of a company in the Commons Register of Members" Interests, thus breaching parliamentary procedure. He was registered with Companies House as the sole director of Boswell and Johnston Limited.