Andy Elkerton is a children's illustrator based in the United Kingdom. His books include How to Catch an Elf, How to Catch the Tooth Fairy, and How to Catch a Leprechaun.Andy Elkerton is a children's illustrator based in the United Kingdom. His books include How to Catch an Elf, How to Catch the Tooth Fairy, and How to Catch a Leprechaun.