Irvine Welsh is the well-known author of the Mark Renton book series.
Welsh focuses on the darker side of human nature and drug use. All of his novels are set in his native Scotland and filled with anti-heroes, small time crooks and hooligans. Welsh manages, however to imbue these characters with a sad humanity that makes them likable despite their obvious scumbaggerry. Irvine Welsh is also known for writing in his native Edinburgh Scots dialect, making his prose challenging for the average reader unfamiliar with this style.