Joe O'Brien lives in Ballyfermot in Dublin with his wife and children. He is the author of nine Alfie Green books as well as three books in the Danny Wilde GAA series for older readers and one fantasy novel, Beyond the Cherry Tree. He has appeared on RTE's The Den, TV3's Ireland AM and many radio shows. His book Alfie Green and the Chocolate Cosmos was shortlisted for Children's Book of the Year at the Irish Book Awards in 2010. He regularly holds readings in bookshops and libraries around the country.
