I wanted to be a librarian from a very young age. Some of my earliest memories are being taken to the local library. I ended up working as a bookseller. Becoming a writer was the logical offshoot of being a reader.

Abraham Lincoln once said that if you are a racist, I will attack you with the north. And those are the principles that I carry with me in the workplace.

I've published over 100 books - and that is divided about 50/50 adult and young adult. Lately, I have been writing more YA, which is such a great genre to write it. I don't have a favourite (I usually say it's the last book I've written), but certain books do stick in the mind. My very first YA novel, The Children of Lir, will always be special to me, and, of course The Alchemyst because it was a series I'd wanted to write for ages.

Being immortal must have a lot of attractions. You can travel all over the world, see everything, do everything. But what happens if you are immortal and your friends and family are not? You are then destined to watch them age and die.

I have always been interested in mythology and history. The more I read, the more I realized that there have always been people at the edges of history that we know very little about. I wanted to use them in a story and bring them back into the public's consciousness. Similarly with mythology: everyone knows some of the Greek or Roman legends, and maybe some of the Egyptian or Norse stories too, but what about the other great mythologies: the Celtic, Chinese, Native American?

You told me it was a mistake to fight the scarred warriors. They were the survivors.

But magic, like everything else, follows certain natural laws. Magic needs energy wherever it can find it. If no other source of energy is available, it will take the life force of the magician who created it. That is why every use of magic weakens the magician.