Oisín McGann was born in Dublin and spent his childhood there and in Drogheda, County Louth. He studied at Ballyfermot Senior College and Dun Laoghaire School of Art and Design, and went on to work in illustration, design and film animation, later moving to London to work as an art director and copy writer in advertising.
He has since become one of Ireland’s most prolific and best-known writer-illustrators, and has produced dozens of books for all levels of reader, in twelve novels. He is the author of the Mad Grandad books, Headbomz: Wreckin' Your Head (in association with the ISPCC), and novels such as Race the Atlantic Wind, The Gods and Their Machines and The Wildenstern Saga. His latest books are We Want Our Park Back, a picture book for Green-Schools, and A Short, Hopeful Guide to Climate Change, a non-fiction book in association with Friends of the Earth, due for release in May 2021. He is the illustrator of Jason Byrne’s Onion O’Brien series, the latest of which is The Secret Scientist.
He is a winner of the European Science Fiction Society Award, CBI's Children's Choice Award and has been shortlisted for numerous other awards, including the Waterstones Childrens’ Book Prize in the UK, le Grand Prix de l'Imaginaire in France and Locus Magazine's Best First Novel Award in the US. He is married with three children, two dogs and a cat, and lives somewhere in the Irish countryside, where he won’t be heard shouting at his computer.