Short answers, pulled from the story.
Gary Gygax published the original Dungeon Master's Guide on the 1st of January 1979. This 232-page hardcover became the bible for game arbiters and included scores of tables and charts for figuring damage and resolving encounters.
David Zeb Cook took the helm for the Advanced Dungeons & Dragons Second Edition Dungeon Master's Guide, releasing it on the 1st of January 1989. Jeff Easley created the cover art while Clyde Caldwell, John and Laura Lakey, and Jean E. Martin provided interior illustrations.
Monte Cook, Jonathan Tweet, and Skip Williams collaborated on the third edition of Dungeons & Dragons, with Cook credited with the design of the Dungeon Master's Guide which was published in September 2000. The 3.5 edition released in 2003 was revised by David Noonan and Rich Redman.
James Wyatt wrote the fourth edition Dungeon Master's Guide which was released on the 6th of June 2008. Shannon Appelcline noted that the book revamped the game's standard world model and introduced a new world setting known as Nentir Vale.
The fifth edition Dungeon Master's Guide was released in 2014 as the last of three core rulebooks for the new edition. Jeremy Crawford and Mike Mearls co-led the design of this book which won the 2015 ENnie Best Supplement Gold award.