Question: Who is known for their prolific work in the horror film genre, Valie Export or Gary Sherman?

full_context: Document 1: Renate Bertlmann: Renate Bertlmann (28 February 1943 in Vienna) is an Austrian feminist avant-garde artist, living and working in Vienna. She is a contemporary of Birgit Jürgenssen and VALIE EXPORT, and her work focuses on the relationship between masculine and feminine forms.
Document 2: Dead &amp; Buried: Dead & Buried is a 1981 science fiction horror film directed by Gary Sherman, starring Melody Anderson, Jack Albertson, and James Farentino. The film focuses on a small town wherein a few tourists are murdered, but their corpses begin to reanimate. With a screenplay written by Dan O'Bannon and Ronald Shusett, the movie was initially banned as a "video nasty" in the UK in the early 1980s, but was later acquitted of obscenity charges and removed from the Director of Public Prosecutions' list.
Document 3: Gary Fleder: Gary Fleder (born December 19, 1965) is an American film director, screenwriter, and producer. His most recently completed film, "Homefront," was released by Open Road Films and Millennium Films in November 2013. In recent years he has been a prolific director of television pilots.
Document 4: Garry Schyman: Garry Schyman (born 1954) is an American film, television, and video game music composer. He graduated from the University of Southern California with a degree in music composition in 1978, and began work in the television industry, writing music for such television series as "Magnum, P.I." and "The A-Team". By 1986, he was composing for movies such as "Judgement" and "Hit List". At the request of a friend in 1993, he composed the music for the video game "Voyeur", but after creating the music for two more games he left the industry, citing the low budgets and poor quality of video game music at the time. He continued to compose for film and television, only to return to video games for 2005's "Destroy All Humans!". Finding that in his absence the quality and perceived importance of video game music had risen substantially, he has since composed for several games, writing the scores to "BioShock" and "Dante's Inferno" among others. He still composes for film however, his latest being "Brush with Danger" directed by young "Indonesian" director "Livi Zheng". He has won numerous awards for his video game scores, including several "soundtrack of the year" awards. Throughout his career, he has worked on over 25 television shows, 10 films, and 13 video games.
Document 5: Viennese Actionism: Viennese Actionism was a short and violent movement in 20th-century art. It can be regarded as part of the many independent efforts of the 1960s to develop "performance art" (Fluxus, happening, action painting, body art, etc.). Its main participants were Günter Brus, Otto Mühl, Hermann Nitsch, and Rudolf Schwarzkogler. As "actionists", they were active between 1960 and 1971. Most have continued their artistic work independently from the early 1970s onwards.
Document 6: The Practice of Love: The Practice of Love (German: "Die Praxis der Liebe" ) is a 1985 Austrian drama film written by and directed by Valie Export. It was entered into the 35th Berlin International Film Festival.
Document 7: Vija Celmins: Vija Celmins is an acclaimed Latvian-American visual artist best known for photo-realistic paintings and drawings of natural environments and phenomena such as the ocean, spider webs, star fields, and rocks. Her earlier work included pop sculptures and monochromatic representational paintings. Based in New York City, she has been the subject of over forty solo exhibitions since 1965, and major retrospectives at the Museum of Modern Art, Whitney Museum of American Art, Los Angeles County Museum of Art, Institute of Contemporary Arts, London, and Centre Pompidou, Paris.
Document 8: Gary King (director): Gary R. King (born November 15, 1972) is an American director and writer.
Document 9: George Sherman: George Sherman (July 14, 1908 – March 15, 1991) was an American film director and producer of low-budget Western films.
Document 10: Poltergeist III: Poltergeist III is a 1988 American supernatural horror film and is the third and final entry in the original "Poltergeist" film series. Writers Michael Grais and Mark Victor, who wrote the screenplays for the first two films, did not return for this second sequel; it was co-written, executive produced, and directed by Gary Sherman, and was released on June 10, 1988 by Metro-Goldwyn-Mayer Pictures. The film was panned by critics, and was a box office disappointment.
Document 11: Gary Sherman (director): Gary Sherman (born 1945), is an American film director, screenwriter, and producer from Chicago, Illinois. He is best known for his prolific work in the horror film genre, directing films such as "Death Line, Dead & Buried", and "Poltergeist III".
Document 12: Import/Export: Import/Export is an Austrian film by the director Ulrich Seidl from 2007. It was nominated for the Palme d'Or at the 2007 Cannes Film Festival and won the Grand Prix - Golden Apricot reward at the Yerevan International Film Festival. The film was shot in Vienna, Ukraine, Romania, the Czech Republic and Slovakia from 2005 until May 2007 on 16mm film. Simultaneously, the film follows a nurse from Ukraine searching for a better life in the West and an unemployed security guard from Austria heading East for the same reason.
Document 13: Valie Export: Valie Export (often written as 'VALIE EXPORT') (born May 17, 1940 in Linz as Waltraud Lehner, later Waltraud Höllinger) is an Austrian artist. Her artistic work includes video installations, body performances, expanded cinema, computer animations, photography, sculptures and publications covering contemporary arts.
Document 14: Valina: Valina was an indie, Noise Rock, Post-Hardcore group from Linz / Austria., which existed from 1995 to 2016. They released several records on Trost Records and played many shows in Europe, United States, Russia, Mexico and South America. The last four full-length albums were recorded by Steve Albini in Chicago. The band began recording music in 1997, releasing several 7-inch records and full-length albums. The full-length albums have been released on their Austrian label Trost Records. Both Vagabond Epode EP have been released in the states by 54' 40' or Fight!. On April 14, 2009, Valina's album, A tempo! a tempo!, was released throughout the United States by Joyful Noise Recordings. The album "Container" was released on March 28, 2014, and their final album "In Position" was released in January 2016.
Document 15: Jim Sharman: James David Sharman (born 12 March 1945), the son of boxing tent entrepreneur Jimmy Sharman, is an Australian director and writer for film and stage with more than 70 productions to his credit. He is renowned in Australia for his work as a theatre director from the 1960s to the present, and is best known internationally as the director of the 1973 theatrical hit "The Rocky Horror Show", its film adaptation "The Rocky Horror Picture Show" (1975) and the film's follow-up "Shock Treatment" (1981).
ground_truth: Gary Sherman