Question: The Button is a comic book that is a buildup toward the event written by which creative officer?

Context paragraphs:
Throne of Atlantis: "Throne of Atlantis" is a 2012–2013 comic book storyline created and published by DC Comics.  The story arc consists of six issues from DC's "Justice League" and "Aquaman" publications, functioning in part as a larger buildup towards the "Trinity War" event.  The plot was written by Geoff Johns, with art by Ivan Reis and Paul Pelletier.

Chris Ryall: Christopher "Chris" Ryall (born April 2) is best known as the Chief Creative Officer and Editor-in-Chief of IDW Publishing (2004–present), and as a writer in the comic book industry.  In February 2011, his Eisner Award-nominated series, "Zombies vs. Robots", co-created with artist Ashley Wood, was optioned by Sony Pictures for Michael Bay’s Platinum Dunes with Mike Flanagan as director.

Free Comic Book Day: Free Comic Book Day, taking place on the first Saturday of May, is an annual promotional effort by the North American comic book industry to help bring new readers into independent comic book stores.  Retailer Joe Field of Flying Colors Comics in Concord, California brainstormed the event in his "Big Picture" column in the August 2001 issue of "Comics & Games Retailer" magazine.  Free Comic Book Day started in 2002 and is coordinated by the industry's single large distributor, Diamond Comic Distributors.

Comic book convention: A comic book convention or comic con is an event with a primary focus on comic books and comic book culture, in which comic book fans gather to meet creators, experts, and each other.  Commonly, comic conventions are multi-day events hosted at convention centers, hotels, or college campuses.  They feature a wide variety of activities and panels, with a larger number of attendees participating in cosplay than most other types of fan conventions. Comic book conventions are also used as a vehicle for industry, in which publishers, distributors, and retailers represent their comic-related releases.  Comic book conventions may be considered derivatives of science-fiction conventions, which began in the late 1930s.

Mark Waid: Mark Waid (born March 21, 1962) is an Eisner Award-winning American comic book writer, known for his work on titles for DC Comics such as "The Flash", "Kingdom Come" and "", and for his work on "Captain America", "Fantastic Four", and "Daredevil" for Marvel Comics.  From August 2007 to December 2010, Waid served as Editor-in-Chief, and later, Chief Creative Officer of Boom!  Studios, where he wrote titles such as "Irredeemable", "Incorruptible", and "The Traveler".

Geoff Johns: Geoff Johns (born January 25, 1973) is an American comic book and television writer, film producer, and television producer.  He is the president and Chief Creative Officer at DC Comics; he has served in the latter position since 2010.  His most notable work in different media has used the DC Comics characters Green Lantern, Aquaman, Flash, and Superman.  He is known for his work on The WB/The CW's "Smallville", "Arrow" and "The Flash".

Doomsday Clock (comics): Doomsday Clock is an upcoming superhero comic book limited series published by DC Comics.  The series is being written by DC's chief creative officer Geoff Johns with art from penciller Gary Frank and colorist Brad Anderson.

Roberto Aguirre-Sacasa: Roberto Aguirre-Sacasa (born 1973) is an American playwright, screenwriter, and comic book writer best known for his work for Marvel Comics and for the television series "Glee", "Big Love", and "Riverdale".  He is Chief Creative Officer of Archie Comics.

The Button (comics): "The Button" is a 2017 comic book crossover created and published by DC Comics.  The story arc consists of four issues from DC's Batman and Flash publications, functioning in part as a larger buildup towards the "Doomsday Clock" event.  The plot was written by Joshua Williamson and Tom King, with art by Jason Fabok and Howard Porter.

North Texas Comic Book Show: The North Texas Comic Book Show is a quarterly comic book convention that is held in Dallas.  The event was created in October 2011 as an alternative to the larger comic conventions.  Initially held in Arlington, TX the event moved to Dallas in November 2013.  It has also been referred to as the Dallas Comic Book Show in marketing and the media.

Supporting paragraphs: The Button (comics) Doomsday Clock (comics)
Answer: Geoff Johns