Billboard's co-chief content officer is turning his longtime coverage of One Direction into a new book, out Nov. 3.

In a year when former One Direction bandmates Niall Horan, Harry Styles, Louis Tomlinson and ZAYN have all either put out or are putting out new music and touring, it's the perfect time to revisit ...

At their peak, One Direction were considered the biggest boy band in the world. Today, they're still regarded as one of the most successful boy bands in history, with the likes of the Backstreet Boys ...