Justin Schein is an American documentary filmmaker and cinematographer.
 He has been cinematographer on over 60 films and is the co-founder of Shadowbox Films.
 He is best known for his work on cinéma vérité films that include "America Rebuilds: A Year at Ground Zero", "No Impact Man", and "Left on Purpose".
A List of American films of 1919 is a compilation of American films that were released in the year 1919.
No Impact Man is a 2009 American documentary film directed by Laura Gabbert and Justin Schein, based on the book by Colin Beavan.
 The film, which premiered September 4, 2009, follows Colin Beavan and his family during their year-long experiment to have zero impact on the environment.
 The film mostly takes place in New York City.
Traceroute is a 2016 Austrian/American documentary film directed by Johannes Grenzfurthner.
 The autobiographical documentary and road movie deals with the history, politics and impact of nerd culture.
 Grenzfurthner calls his film a "personal journey into the uncharted depths of nerd culture, a realm full of dangers, creatures and more or less precarious working conditions", an attempt to "chase the ghosts of nerddom's past, present and future."
 The film was co-produced by art group monochrom and Reisenbauer Film.
 It features music by Kasson Crooker, Hans Nieswandt, and many others.
Wesley Earl "Wes" Craven (August 2, 1939 – August 30, 2015) was an American film director, writer, producer, and actor.
 He was known for his pioneering work in the genre of horror films, particularly slasher films, where his impact on the genre was considered prolific and influential.
 Due to the success and cultural impact of his works in the horror film genre, Craven has been called the "Master of Horror".
A List of American films of 1925 is a compilation of American films that were released in the year 1925.
The National Film Preservation Foundation (NFPF) is an independent, nonprofit organization created by the U.S. Congress to help save America’s film heritage.
 Growing from a national planning effort led by the Library of Congress, the NFPF began operations in 1997.
 It supports activities nationwide that preserve American films and improve film access for study, education, and exhibition.
 The NFPF's top priority is saving orphan films, so called because are not protected by commercial interests and are unlikely to survive without public support.
 Through its grant programs, the NFPF has helped archives, historical societies, libraries, museums, and universities from all 50 states preserve American films and make them available to the public.
There has been a stereotyping of minorities and people of colour in the horror genre, especially within American films.
 Throughout the history of the genre there has a devaluing of the roles of minorities within such films, and according to one critic "a use of aspects from their culture as fodder for the plot".
 These films tend to have a predominately white casts and audience, and cast minorities as violent, and as monsters and villains.
 The horror genre in particular holds the power to play with aspects of violence in intriguing and symbolic ways.
A List of American films of 1918 is a compilation of American films that were released in the year 1918.
A list of American films of 1917 is a compilation of American films released in 1917.

Question: No Impact Man and Traceroute, are American films, of which genre?
Answer: documentary