He’s an author I mentioned recently when I highlighted last year’s Eisner Award winners and nominees for kids. Many of his books are aimed at teens (including the fantastic Boxers and Saints— two companion books about the Boxer Rebellion– which I can’t recommend highly enough). One of his newer comics, Secret Coders, is for middle grade readers.
When I was looking up the story I heard on the radio, I came across an interesting article about changes in who reads comics and how adults view comics for children. There is a lot of good material for younger readers being published right now. If you need some suggestions, just ask at the Children’s Services desk!