After a six-year period as a Financial Post columnist from 1985 to 1991, Coyne joined The Globe and Mail's editorial board.[6] There, Coyne won two consecutive National Newspaper Awards for his work.[9] He had a regular column in the Globe between 1994 and 1996, when he joined Southam News (later CanWest News Service) as a nationally syndicated columnist.[7]
Coyne became a columnist with the National Post – the successor to the Financial Post – when it launched in 1998.[10] Coyne left the Post in 2007 to work at Maclean's.[10]
Coyne left Maclean's in 2011 to return to the Post as a columnist.[10] In December 2014, he was appointed to the position of Editorials and Comment Editor.[11] After years of writing a weekly Saturday column, Coyne's contribution was absent from the edition published just prior to the 2015 Canadian federal election, because the column he wanted to submit called for a vote against the Conservative Party of Canada while the Post's editorial board had endorsed the Conservatives.[12][10] While Coyne was the head of the editorial board, the decision to endorse the Conservatives was made by the newspaper's publisher Paul Godfrey.[10] On election day, Coyne announced that as a result of the paper refusing to run his election column, he was resigning as the Post's editorial page and comment editor but would remain as a columnist.[10][13]
Coyne has been a longtime member of the At Issue panel on CBC's The National,[5] where he appeared as early as 2012 in the day of Peter Mansbridge.[14] His role on the panel hosted by CBC Chief Political Correspondent Rosemary Barton has made him a household name appearing every Thursday evening alongside panelists Chantal Hébert and Althia Raj.
In November 2019, Coyne announced that he would henceforth be employed by The Globe and Mail.[15]
Coyne is a proponent of the Century Initiative, a proposal spearheaded by Dominic Barton to increase Canada's population to 100 million by 2100. He admits that this lofty goal might not increase Canada's standard of living. Nevertheless he supports it because it is ambitious and might result in more global clout for his home country.[16]
^ abcDevoe Kim, Cheryl (9 June 1997). "Mighty Mouth". Ryerson Review of Journalism. Archived from the original on 11 November 2011. Retrieved 13 October 2016.