Leith-born Irvine Welsh is one of Scotland’s most popular authors, having short to fame with his debut novel Trainspotting in 1993.
He published his 14th novel, Resolution, earlier this year and has also written, or co-written, a further six books of short stories, 10 screeplays and three stage plays.
Many of his books have been turned into films, including two Trainspotting movies, Filth, The Acid House and Ecstasy.
And when he’s not writing he’s also dabbled in directing and is an in-demand DJ.
To mark his 66th birthday, which he celebrated today (September 27) here are a few words of wisdom from the man himself.
17. Irvine Welsh on...Scottish nationalism
"It's ironic that the growth of Scottish nationalism has precipitated in the English the sort of hand-wringing the Scots have always done over who they are." | AFP via Getty Images