Question: Tower is a 2016 animated documentary film directed by Keith Maitland about the 1966 shootings at the University of Texas at Austin, by who?

Context paragraphs:
Tower (2016 film): Tower is a 2016 animated documentary film directed by Keith Maitland about the 1966 shootings at the University of Texas at Austin.  The film is 82 minutes long, reduced from 92 minutes after the SXSW screening and premiered at the 2016 South by Southwest.

University of Texas tower shooting: On August 1, 1966, Charles Whitman, a former Marine sharpshooter, took rifles and other weapons to the observation deck atop the Main Building tower at The University of Texas at Austin, then opened fire on persons indiscriminately on the surrounding campus and streets.

Flawed (film): Flawed is a 2010 short animated documentary film and website by Halifax filmmaker Andrea Dorfman about body image, combining stop-motion animation and hand-painted images.  "Flawed" was produced in Halifax by Annette Clarke for the National Film Board of Canada.

To Demonstrate How Spiders Fly: To Demonstrate How Spiders Fly is a 1909 British short silent animated documentary film, directed by F. Percy Smith, featuring a close-up of an animated model spider throwing its silken thread to take to the air.  The film features, "the first of several animated creatures to appear in Smith's films," and according to Jenny Hammerton of BFI Screenonline was made in the belief, "that he could cure people of their fear of spiders by showing them blown up images of their eight legged foes on the cinema screen."

The Delicate Art of the Rifle: The Delicate Art of the Rifle is a 1996 independent film directed by Dante W. Harper, with a screenplay by Stephen Grant, based on his short story by the same name.  It is a surrealistic comedy-drama about a school shooting as seen through the eyes of a socially awkward college student named Jay.  Walt Whitman, the shooter, is loosely based on Charles Whitman, but the film is not in any way a factual account of the 1966 shootings at the University of Texas.

Mixed Match: Mixed Match is a 2016 animated/live-action documentary film directed by Canadian director Jeff Chiba Stearns.  The documentary explores the challenges multi-ethnic blood disease patients face when trying to find a bone marrow match for transplant.

Ari Folman: Ari Folman (Hebrew: ארי פולמן) (born December 17, 1962) is an Israeli film director, screenwriter and film score composer.  He is perhaps best known for directing his animated documentary film "Waltz With Bashir" as well as directing the live-action/animated film "The Congress".  He currently plans to direct an animated drama film based on the life of Anne Frank during the Holocaust.

Money as Debt: Money as Debt is a 2006 animated documentary film by Canadian artist and filmmaker Paul Grignon about the monetary systems practised through modern banking.  The film presents Grignon's view of the process of money creation by banks and its historical background, and warns of his belief in its subsequent unsustainability.  Subsequent "Money as Debt" videos include "Money as Debt II Promises Unleashed" (2009) and "Money as Debt III: Evolution Beyond Money" (2011).

Proteus (2004 film): Proteus is an animated documentary film written and directed by David Lebrun in 2004.  It depicts a 19th century understanding of the sea with particular emphasis on the life and work of German biologist and researcher Ernst Haeckel.  One-celled microorganisms known as radiolarians feature prominently in Haeckel's fascination with the observable natural world and the underlying guiding principles assumed to be implicit in its very existence.

25 April (film): 25 April is a 2015 New Zealand animated documentary film about the 1915 Gallipoli Campaign directed by Leanne Pooley.  It was screened in the Contemporary World Cinema section of the 2015 Toronto International Film Festival.

Supporting paragraphs: Tower (2016 film) University of Texas tower shooting
Answer: Charles Whitman