For the past 40 years, Bill Gray has been an avid student of boxing history. The seed for Boxing's Top 100 - The Greatest Champion's of All Time, was planted on November 10, 1965, when Gray, a native of Pittsburgh, PA., attended the final fight in the career of Sugar Ray Robinson. On that night, Robinson was defeated by number one middleweight contender Joey Archer. Gray, then age 13, recalls being (literally) struck by an old-time fight fan sitting next to him. When  Robinson was floored in round four, the man elbowed Gray in the ribs and said, "Kid, it's too bad you never saw Sugar Ray fifteen or twenty years ago. There's never been a fighter like him."

In the midst of his long career as a baseball writer, historian and player analyst, Gray began work on Boxing's Top 100 - The Greatest Champions of All Time in the late 1990s. This book is a work of boxing history and is perhaps the most comprehensive statistical analysis and ranking of boxing champions that has ever been published.  

In addition to Boxing’s Top 100 – The Greatest Champions of All Time, Gray has edited and written for more than thirty baseball and football books and periodicals, including Benson’s Baseball Annual, Rotisserie League Baseball and Benson’s A to Z Scouting Guide. In 1995 Gray’s work was featured in Baseball’s Top 100—The Best Individual Seasons of All Time, which received The Sporting News SABR Award for notable insight and advancement of knowledge.