Duff McKagan - Rock musician

Duff McKagan nearly drank himself to death, he was one of the founding members of Guns N' Roses - a band famed as much for its bad behaviour as for its music.

But for Duff McKagan, that stopped when - as he puts it - his pancreas exploded.

So he sobered up and went to university.

Now, alongside his financial column for Playboy, he runs a wealth management firm.

So how does the bad boy of rock become a businessman?

(Image: Duff McKagan. Credit: Getty)