The Huffington Post's executive editor Tim O'Brien is leaving the site to work on the second installment of his five-book series, a spokesman told TheWrap.
O'Brien, a former New York Times Sunday Business editor and 2009 Pulitzer Prize finalist, is working for Random House on a series of historical thrillers set shortly after the assassination of President Abraham Lincoln.
"Tim has a book contract he wants to fulfill, and he wants to be fully engaged in his book writing," HuffPost spokesman Rhoades Alderson told TheWrap.
It remains unclear whether O'Brien will be replaced, but Alderson said his duties will be distributed to the senior editorial team of Howard Fineman, Peter Goodman, Ryan Grim, Kate Palmer, John Montorio, Sam Stein and Amanda Terkel.
Arianna Huffington, the site's founder and editor-in-chief, announced O'...