Question: Are William S. Hart and Valie Export both video artists?

Context paragraphs:
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.

Betty Tompkins: Betty Tompkins (born 1945) is an American artist.  Tompkins is a painter whose works revolve, almost exclusively, around photorealistic, close-up imagery of both heterosexual and homosexual intimate acts.  She creates large-scale, monochromatic canvases and works on paper of singular or multiple figures engaged in sexual acts, executed with successive layers of spray painting over pre-drawings formed by text.  Alongside artists such as Carolee Schneemann, Yoko Ono, Valie Export, Joan Semmel, Lynda Benglis and Judy Chicago, Tompkins has been re-assessed as a pioneer of Feminist art.  Tompkins is listed in The Brooklyn Museum's Elizabeth A. Sackler Center for Feminist Art's Feminist Art Base.  Her first painting, completed in 1969, is held in the permanent collection of the Centre Georges Pompidou in Paris, France.

Maya Deren Award: The American Film Institute Award for Independent Film and Video Artists, subtitled and generally known as the Maya Deren Award, was an award presented to filmmakers and video artists by the American Film Institute to honor independent filmmaking.  Named for the avant-garde experimental film artist Maya Deren, it was given from 1986 through 1996.

Video Artists International: Video Artists International (VAI), is an independent American DVD-label specializing in classical music performances founded in 1983, and based in Pleasantville, NY.  The company started as one of the first labels to release complete operas and ballets on home video, originally in VHS videocassette format.  In the early 1990s the label added historical CDs to its video catalogue.  VAI's video catalog includes an extensive series of performances from The Bell Telephone Hour.  Among the first CDs were performances of arias by Phyllis Curtin, and the 1962 recording of the New Orleans Opera's production of Carlisle Floyd's Susannah (with Curtin and Norman Treigle).

Perpetual Art Machine: Perpetual Art Machine (PAM) was founded in New York City in January 2006 by artists Chris Borkowski, Aaron M. Miller, Raphaele Shirley and Lee Wells in collaboration with Alexis Hubshman, president of the Scope art fair.  Through the use of open source CMS and DAM software such as Joomla and Gallery2, streaming video technologies and custom software developed in Max/MSP and Jitter, as well as MySQL, PAM has become a video art portal on the internet.  Since its first installation in at the Scope New York art fair in March 2006 PAM has grown via its web site into a free community of more than 900 artists from over 50 countries and consists of over 1000 video art works on-line and in its interactive video installation.  PAM has featured a number of notable video artists, including Lev Manovich, Janet Biggs, and John Criscitello.

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.

William S. Hart: William Surrey Hart (December 6, 1864 – June 23, 1946) was an American silent film actor, screenwriter, director and producer.  He is remembered as a foremost western star of the silent era who "imbued all of his characters with honor and integrity."  During the late 1910s and early 1920s, he was one of the most consistently popular movie stars, frequently ranking high among male actors in popularity contests held by movie fan magazines.

Gorilla Tapes: Gorilla Tapes was the collective name of British Scratch Video artists Jon Dovey (b 1955), Gavin Hodge (b 1954) and Tim Morrison (b. 1955).  'Scratch' is the art of 'sampling' and repeating found images and sounds, thereby making a new work.  With simple video editing equipment and images recorded from television, during the mid-1980s Gorilla Tapes made sharp satirical and political videos collaged from old film footage and the TV news imagery of the mid-Thatcher years.  Gorilla Tapes have exhibited internationally in solo and group exhibitions.  Highlights include participation in Tate Britain's A Century of Artists Films (2003).

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.

Kathy Rae Huffman: Kathy Rae Huffman is a US-American curator, writer, producer, researcher, lecturer and expert for video and media art.  Since the early 1980s, Huffman is said to have helped establish video and new media art, online and interactive art, installation and performance art in the visual arts world.  She has curated for, written about, and coordinated events for numerous international art institutes, consulted and juried for festivals and alternative arts organisations.  Huffman not only introduced video and digital computer art to museum exhibitions, she also pioneered tirelessly to bring television channels and video artists together, in order to show video artworks on TV.  From the early 1990s until 2014, Huffman was based in Europe, and embraced early net art and interactive online environments, a curatorial practice that continues.  Till today, Huffman is working in the USA and in Europe.

Supporting paragraphs: William S. Hart Valie Export
Answer: yes