In the wake of JK Rowling’s being outed as the pseudonymous author of a crime novel, this is a list feature on other authors who’ve written under other names. It’s a commission for Empire with little-to-no film content at all, but I guess the Rowling / Harry Potter connection made it seem relevant enough.
http://www.empireonline.com/features/famous-author-pseudonyms
Credit where it’s due: the picture I’ve used here is from the Flickr account of a photographer calling him-or-herself Midnight Digital. It’s a piece inspired by Stephen King’s The Dark Half, which I mention in the article.