Question: Justin David Swibel and Guillermo del Toro are both what?

Context paragraphs:
Chuck Hogan: Chuck Hogan (born August 4, 1967) is an American novelist, screenwriter, and television producer.  He is best known as the author of "Prince of Thieves", and as the co-author of "The Strain" trilogy with Guillermo del Toro.  Alongside del Toro, Hogan created the television series "The Strain" (2014–present), adapting their trilogy of vampire novels.

The Devil's Backbone: The Devil's Backbone (Spanish: El espinazo del diablo ) is a 2001 gothic horror film directed by Guillermo del Toro, and written by del Toro, David Muñoz, and Antonio Trashorras.  It was independently produced by Pedro Almodóvar, and filmed in Madrid.

Sundown (video game): Sundown (also known as Guillermo del Toro's Sundown) is an unreleased video game that was under development by Terminal Reality for the PlayStation 3 and Xbox 360.  Not much is known about the game, except that film director Guillermo del Toro was co-developing the game, and it would take place in a world where the players would have to survive an apocalypse while fighting against zombies.  According to del Toro, the game would have been similar to "Left 4 Dead".

Bocas del Toro Archipelago: The Bocas del Toro Archipelago is a group of islands in the northwest of the Caribbean Sea in Panama.  The archipelago separates Almirante Bay and Chiriquí Lagoon from the open Caribbean Sea.  The archipelago is part of the Bocas del Toro District which is part of Bocas del Toro Province.  The major city is Bocas del Toro, also called Bocas Town, on Isla Colón.  The islands are accessible by water taxis and private boats.  Isla Colón is accessible by airplanes, ferries, private boats, and water taxis.  Bocas del Toro "Isla Colón" International Airport, located just west of Bocas Town, provides air transportation to and from the islands.  Ferries serve Bocas Town from Almirante, Changuinola, and Chiriquí Grande.

Guillermo del Toro's unrealized projects: The following is a list of unproduced Guillermo del Toro projects in roughly chronological order.  During his decades-long career, Mexican film director Guillermo del Toro has worked on a number of projects that never progressed beyond the pre-production stage.  Some of these projects fell into development hell and are presumably canceled.

The Strain (TV series): The Strain is an American horror drama television series that premiered on FX on July 13, 2014.  It was created by Guillermo del Toro and Chuck Hogan, based on their novel trilogy of the same name.  Carlton Cuse serves as executive producer and showrunner.  Del Toro and Hogan wrote the pilot episode, "Night Zero", which del Toro directed.  A thirteen-episode first season was ordered on November 19, 2013.  The pilot episode premiered at the ATX Television Festival in Austin, Texas, in early June 2014.

Justin David Swibel: Justin David Swibel (born April 1, 1983) is an American screenwriter, director, and producer.

Guillermo del Toro: Guillermo del Toro Gómez (] ; born October 9, 1964) is a Mexican-American film director, screenwriter, producer and novelist.  In his filmmaking career, del Toro has alternated between Spanish-language dark fantasy pieces, such as the gothic horror film "The Devil's Backbone" (2001), and "Pan's Labyrinth" (2006), and more mainstream American action movies, such as the vampire superhero action film "Blade II" (2002), the supernatural superhero film "Hellboy" (2004), its sequel "" (2008), and the science fiction monster film "Pacific Rim" (2013).  His latest film, "The Shape of Water", won the Golden Lion at the Venice Film Festival and is scheduled for an American release on December 8, 2017.

The Shape of Water (film): The Shape of Water is a 2017 American romantic fantasy film directed by Guillermo del Toro and written by del Toro and Vanessa Taylor.  The film stars Sally Hawkins, Michael Shannon, Richard Jenkins, Doug Jones, Michael Stuhlbarg, and Octavia Spencer.  It was screened in the main competition section of the 74th Venice International Film Festival and premiered on August 31, 2017, where it was awarded the Golden Lion for best film in the competition.  It also screened at the 2017 Toronto International Film Festival.  "The Shape of Water" has been met with high praise from critics, with many declaring it Del Toro's best film since "Pan's Labyrinth" and particularly praising Sally Hawkins' performance.  It is scheduled for release in the United States on December 8, 2017.

Doña Lupe: Doña Lupe is a 1985 short horror film written and directed by Guillermo del Toro.  It is del Toro's ninth short film, though the first eight remain unreleased.  Del Toro filmed "Doña Lupe" at 19 years of age; reviewers have noted that the film "feels like the work of an amateur artist getting to grips with his craft".

Supporting paragraphs: Justin David Swibel Guillermo del Toro
Answer: screenwriter