In January 2014, Campbell announced that he was joining "British GQ" with a brief to conduct interviews with figures from "politics... sport, business, culture, (and) other aspects of life that I find interesting", succeeding Piers Morgan. In his role at "GQ" Campbell has interviewed a wide range of people, including Jose Mourinho, Raheem Sterling, Trent Alexander-Arnold, Mario Balotelli, Mo Farah and Usain Bolt from the world of sport and Tony Blair, Sadiq Khan, Nicola Sturgeon, George Osborne, John McDonnell, John Bercow, and Chuka Umunna from the world of politics, as well as conducting in depth interviews with many other figures from public life, including Archbishop Justin Welby, Garry Kasparov and Rachel Riley. In 2017, he conducted an interview with Prince William. In March 2017, "GQ" began to film the interviews to use as part of their digital platform, beginning with an interview with Owen Jones, and then Tony Blair. When Jeremy Corbyn was interviewed for the magazine in late 2017, he did so on the condition that Campbell would not be the interviewer.