But, Jo Rowling isn't the first author to go undercover. Check out these other authors who have published books under the cover of a pen name.
Lemony Snicket (aka Daniel Handler)
Author of the beloved childhood series, A Series of Unfortunate Events, Daniel Handler went undercover with the pen name Lemony Snicket, one of the characters in the book. In 2011 Handler wrote the Printz honored YA novel Why We Broke Up as himself.
James Frey (aka Pittacus Lore)
In 2009 James Frey, the author who was famous for basically lying to Oprah, started a book packaging company for YA fiction. His goal was to create highly marketable fiction that would sell to Hollywood. Working with MFA student Jobie Hughes the two put together I Am Number Four under the name Pittacus Lore.
Paula Stokes ( aka Fiona Paul)
Fiona Paul's Venom swept readers into the world of Renaissance Venice, in 2014 Fiona Paul will be taking a break while Paula Stokes releases two contemporary novel from HarperTeen; Liars, Inc and The Art of Lainey.
Stephen King (aka Richard Bachman)
This is probably the closest incident to what happened with Jo Rowling. In the 1970's and 1980's King published a few novels as Richard Bachman so as not to oversaturate the market of his brand. He even went as far as to use his literary agent's insurance agent's picture as the author photo. However when one bookseller figured it out, the sale of the books skyrocketed.
Michelle Rowen (aka Morgan Rhodes)
Michelle Rowen is known for her supernatural romances for teens and adults. In 2012 she debuted the high fantasy, Falling Kingdoms, under the name Morgan Rhodes. Interesting fact--Rowen also published a futuristic thriller in 2008 under the name Michelle Maddox, but it will be republished under her real name with Harlequin Teen.
Robyn Schneider ( aka Violet Haberdasher)
Having previously published YA fiction and non-fiction Schneider published her middle grade series, Knightley Academy, under the pen name Violet Haberdasher.