After training as an electrical technician, Hart served on 3 of Her Majesty's Canadian Ships: (HMCS) Gatineau, Qu'Appelle and Yukon.
In 1998, as a member of Canada's official opposition, he was elected by his peers as the Vice Chairman of the House Standing Committee of Defense and Veterans’ Affairs.
As well, Hart was appointed as Chief Opposition Critic for a number of senior portfolios including Defense, Veterans’ Affairs, and Justice.
[3] Hart resigned as a Member of Parliament in order so that newly elected Canadian Alliance leader Stockwell Day could enter the House of Commons through a by-election.
The Canadian Alliance maintained that the payment was made to cover lost income between the time of his resignation and the date of the next election, and was not an inducement.
The RCMP inquiry concluded that an investigation was not necessary and that neither Hart nor the Canadian Alliance had committed a criminal offence, and no charges were ever laid in the matter.
In 2005, Hart received an honorary doctorate from Georgian Technical University for his work in parliament and promoting democracy in Georgia.