Question: Who directed Watchmen and 300?

Context paragraphs:
Arputha Theevu: Arputha Theevu(Albudhadweep) is a Tamil dubbed periodical drama film directed by Vinayan. It was released on 14 April 2007 starring Prithviraj, Guinness Pakru and Mallika Kapoor amongst others.  It is the Tamil dubbed version of Malayalam film Albudhadweep. The music was composed by M.Jayachandran. The original version Albhutha Dweepu was released in 2005 and the remake rights were sold almost immediately to Hollywood director Ron Howard who was in India at that time.The film stars 300 dwarfs, and all 300 are to enact the same role in Hollywood version of the movie with Leonardo DiCaprio.

300: Rise of an Empire: 300 Rise of an Empire is a 2014 American epic historical fantasy war film directed by Noam Murro.  It is a follow-up to the 2006 film "300", taking place before, during and after the main events of that film and based on the Battle of Artemisium and the Battle of Salamis.  It is based on the as-yet-unreleased Frank Miller graphic novel "Xerxes".  Zack Snyder, who directed and co-wrote the original film, acts as writer and producer on "Rise of an Empire".

Jon Gustafsson: Jon Gustafsson is an Iceland born film director.  The Icelandic spelling of his name is Jón Gústafsson.  Best known for directing the Canadian documentary film Wrath of Gods, starring Gerard Butler, Wendy Ord, Sarah Polley, Paul Stephens and Sturla Gunnarsson.  He grew up in Iceland where he started his career as a television performer before studying filmmaking at Manchester Polytechnic and directing for film and theatre at CalArts where he was mentored by the legendary Ealing Studios director Alexander Mackendrick.  Wrath of Gods was his second documentary for CBC Newsworld, the first one was The Importance of Being Icelandic.  He immigrated to Canada where he directed the low-budget feature film Kanadiana and the music video Brighter Hell for the Canadian rock band The Watchmen.  In 2011 Jon Gustafsson produced the award winning short film In A Heartbeat, directed by Karolina Lewicka, through his production company Artio Films.

Deborah Snyder: Deborah Snyder (née Johnson) is an American producer of feature films and television commercials.  She is married to filmmaker Zack Snyder, and has worked as his frequent producing partner on films such as "Watchmen" and "300".  She is the co-founder of the production company Cruel and Unusual Films.

Production of Watchmen: Watchmen is a 2009 film based on the twelve-issue graphic novel series of the same name created by writer Alan Moore, artist Dave Gibbons, and colorist John Higgins, published by DC Comics between 1986 and 1987.  The graphic novel's film rights were acquired by producer Lawrence Gordon in 1986.  Many problems halted the adaptation's development, with four different studios and various directors and screenwriters being attached to the project through twenty years.  In 2006, Zack Snyder, who at the time was filming 'another comic book adaptation', was hired by Warner Bros. to helm "Watchmen".  Filming started in 2007, and following deals with two of the previous companies involved in the development—Paramount Pictures was responsible for international distribution rights after budgetary issues in 2004, resulting in a lawsuit by 20th Century Fox.  Fox, which was already contacted by Gordon in 1987, received $1 million of the gross—the "Watchmen" adaptation was finally released in March 2009.

Improvement commissioners: Boards of improvement commissioners were "ad hoc" urban local government boards created during the 18th and 19th centuries in the United Kingdom of Great Britain and Ireland and its predecessors the Kingdom of Great Britain and the Kingdom of Ireland.  Around 300 boards were created, each by a private Act of Parliament, typically termed an Improvement Act.  The powers of the boards varied according to the acts which created them.  They often included street paving, cleansing, lighting, providing watchmen or dealing with various public nuisances. Those with restricted powers might be called Lighting Commissioners, Paving Commissioners, Police Commissioners, etc.

300 (film): 300 is a 2006 American epic war film based on the 1998 comic series "300" by Frank Miller and Lynn Varley.  Both are fictionalized retellings of the Battle of Thermopylae within the Persian Wars.  The film was directed by Zack Snyder, while Miller served as executive producer and consultant.  It was filmed mostly with a super-imposition chroma key technique, to help replicate the imagery of the original comic book.

Zack Snyder: Zachary Edward Snyder (born March 1, 1966) is an American filmmaker, best known for his action, superhero, and science fiction films.  Snyder made his feature film debut with the 2004 remake of the horror film "Dawn of the Dead".  Since then, he has done a number of comic book and superhero films, including "300" (2007) and "Watchmen" (2009), as well as the Superman film that started the DC Extended Universe, "Man of Steel" (2013) and its follow-ups, "" (2016) and "Justice League" (2017).  He also co-wrote the screenplays for "300", "Sucker Punch" and "".

Watchmen (film): Watchmen is a 2009 American superhero film directed by Zack Snyder, based on the 1986–87 DC Comics limited series of the same name by Alan Moore and Dave Gibbons.  It stars an ensemble cast of Malin Åkerman, Billy Crudup, Matthew Goode, Carla Gugino, Jackie Earle Haley, Jeffrey Dean Morgan, and Patrick Wilson.  A dark satirical and dystopian take on the superhero genre, the film is set in an alternate history in the year 1985 at the height of the Cold War between the United States and the Soviet Union, as a group of mostly retired American superheroes investigates the murder of one of their own before uncovering an elaborate and deadly conspiracy, while their moral limitations are challenged by the complex nature of the circumstances.

Steven R. Gilmore: Steven R. Gilmore is an artist and graphic designer most known for his work on album cover design, particularly his role as in-house artist for Nettwerk Records for much of the 1980s and 1990s.  He has designed record album sleeves for Skinny Puppy, Nickelback, A Perfect Circle, BT, Machines of Loving Grace, Two Steps from Hell and many others.  Gilmore also created the promotional materials for films such as "The Dark Knight", "300", "Watchmen" and "The Lord of the Rings".

Supporting paragraphs: Production of Watchmen 300 (film)
Answer: Zack Snyder