Ewen is the former defence and intelligence correspondent for The Guardian having worked for the UK media organisation for 22 years.
He played a key role in reporting the revelations from computer analyst whistle-blower Edward Snowden about the mass surveillance by US and UK intelligence agencies. He has received a number of prestigious awards for this work and was a member of the Guardian team who, along with the Washington Post, received a Pulitzer Prize in 2014.
During his career with The Guardian he held a number of senior editorial roles including Washington bureau chief, diplomatic editor and chief political editor.
Before joining The Guardian he was political editor of The Scotsman.
Ewen has worked on a number of projects with the Thomson Foundation and is acting as a mentor for participants on the Thomson Foundation digital and multimedia summer course. He is also assisting participants from the Journalism Now e-learning programme on investigative journalism techniques.