Belfast man Colin Davidson is one of Ireland's most celebrated painters.
Queen Elizabeth II, Bono, Ed Sheeran and Seamus Heaney are among the host of famous faces to have sat for him.
He's painted Angela Merkel for Time Magazine, and he's even been employed to teach Brad Pitt how to paint.
Yet the Belfast-born painter regards his greatest work as a series of 18 portraits, which he did for free.
The subject of those paintings are ordinary people whose lives were devastated by the Troubles.
In his new book, titled 'Twelve Paintings: Conversations with Mark Carruthers' the NI artist speaks to BBC Journalist about 12 of his key works about why he does what he does.
Belfast Telegraph's Northern Ireland Editor Sam McBride is joined by Colin Davidson and Mark Carruthers.