As an author Bill has written or co-authored over a dozen books, and dozens of articles and short stories, including the Authorized Mycroft Holmes novels. An avid historian, Bill has
written and edited over a dozen books about military history, including his How to Lose a War series, and two oral histories of the SEALs in Vietnam. As an anthologist Bill has edited or
co-edited almost 50 anthologies. He is also one of the founders of Mayfair Games, a board and role play gaming company.