[3] In 2021, it was reported in The Times newspaper, citing an article by Greenslade in the British Journalism Review, that he supported the bombing campaign of the Provisional IRA.

[5] Greenslade's father, Ernest Frederick William, was an insurance clerk, and his mother Joan Olive (née Stocking) was a book-keeper.

[6] Greenslade started work at the Barking and Dagenham Advertiser aged 17, and also delivered the newspaper to newsagents to supplement his low wages.

[9] While editor of the Daily Mirror, Greenslade rigged a spot-the-ball competition in the paper to make sure it was un-winnable on instructions from his proprietor, Robert Maxwell.

[2][13] In the context of a changing industry, Greenslade concluded his last column for the Standard with the observation: "Whatever happens, this I know: journalism, the trade I have practised for more than 50 years, must survive.

Greenslade is on the board of an academic quarterly, the British Journalism Review, and was a trustee of the media ethics charity, MediaWise.

John Mair, Steven McCabe, Neil Fowler & Leslie Budd (Bite-sized Books, 2019) Foreword to Media Guidelines for Reporting Suicide (Samaritans, 2020) "How the United Kingdom’s tabloids go about it" in Investigative Journalism, third edition, eds.

[17] During the late 1980s, when he was managing news editor of The Sunday Times, Greenslade secretly wrote for An Phoblacht, a newspaper published by Sinn Féin.

[20] On the 30th anniversary of the H Block prison hunger strikes, Greenslade gave a speech at a Sinn Féin conference in London and An Phoblacht published his article on the subject.

[21] Greenslade has had a house in County Donegal for many years, and a close personal friend is Pat Doherty, who from 1988 until 2009 was vice president of Sinn Féin, and who has been publicly named as a former member of the IRA Army Council.

"[24] Then editor Alan Rusbridger denied Glover's claims of the paper having a "Republican cell" at the time and decades later when Greenslade's views became clear.

In the British Journalism Review article, Greenslade stated he had secretly and explicitly supported the IRA's bombing campaign since the early 1970s.

[4][19] His reasoning for keeping his convictions secret, including refusing to disclose them to his commissioning editors when he wrote articles about Irish republicanism or Sinn Féin, was that he needed "to pay his mortgage".

"[29][27] Greenslade has been criticised by Rusbridger, his former editor at The Guardian, for his behaviour over this article and lack of transparency over his belief in the IRA's armed struggle.