The Wheel of Time Companion is an encyclopedia and guidebook to the world of The Wheel of Time. It was published in November 2015. It was written by Harriet McDougal, Robert Jordan's widow and editor, with the assistance of Maria Simons and Alan Romanczuk. Maria and Alan were Robert Jordan's writing assistants and fact-checkers during the writing of most of the novels of the main series. The book draws heavily upon Robert Jordan's unpublished notes and outlines for the series.