After leaving school he got his degree from Dublin university and qualified as a primary school teacher, returning to work in Wexford. He married in 1991 and he and his wife spent about 4 years between 1992 and 1996 working in Saudi Arabia, Tunisia and Italy. His first book, Benny and Omar, was published in 1998, based on his experiences in Tunisia; it has since been translated into many languages. A sequel followed in 1999, followed by some other books (see below). Then in 2001 the first Artemis Fowl book was published and he was able to resign from teaching and concentrate fully on writing.

He says, "I will keep writing until people stop reading or I run out of ideas. Hopefully neither of these will happen anytime soon. He lives in Ireland with his wife and two children.