those involved with concurrent movements in conceptual art, performance, and experimental film. These include Americans Vito Acconci, Valie Export, John Baldessari, Peter Campus, Doris Totten Chase, Maureen Connor, Norman Cowie, Dimitri Devyatkin, Frank Gillette, Dan Graham, Gary Hill, Joan Jonas, Bruce Nauman, Nam June Paik, Bill Viola, Shigeko Kubota, Martha Rosler, William Wegman, and many others. There were also those such as Steina and Woody Vasulka who were interested in the formal qualities of video and employed video synthesizers to create abstract works. Kate Craig, Vera Frenkel and Michael Snow were important to the development of video art in Canada. In the 1970s Much video art in the medium's heyday experimented formally with the limitations of the video format. For example, American artist Peter Campus' Double Vision combined the video signals from two Sony Portapaks through an electronic mixer, resulting in a distorted and radically dissonant image. Another representative piece, Joan Jonas' Vertical Roll, involved recording previously-recorded material of Jonas dancing while playing the videos back on a television, resulting in a layered and complex representation of mediation. Much video art in the United States was produced out of New York City, with The Kitchen, founded in 1972 by Steina and Woody Vasulka (and assisted by video director Dimitri Devyatkin and Shridhar Bapat), serving as a nexus for many young artists. An early multi-channel video art work (using several monitors or screens) was Wipe Cycle by Ira Schneider and Frank Gillette. Wipe Cycle was first exhibited at the Howard Wise Gallery in New York in 1969 as part of an exhibition titled "TV as a Creative Medium". An installation of nine television screens, Wipe Cycle combined live images of gallery visitors, found footage from commercial television, and shots from pre-recorded tapes. The material was alternated from one monitor to the next in an elaborate choreography. On the West coast, the San Jose State television studios in 1970, Willoughby Sharp began the "Videoviews" series of videotaped dialogues with artists. The "Videoviews" series consists of Sharps’ dialogues with Bruce Nauman (1970), Joseph Beuys (1972), Vito Acconci (1973), Chris Burden (1973), Lowell Darling (1974), and Dennis Oppenheim (1974). Also in 1970, Sharp curated "Body Works", an exhibition of video works by Vito Acconci, Terry Fox, Richard Serra, Keith Sonnier, Dennis Oppenheim and William Wegman which was presented at Tom Marioni's Museum of Conceptual Art, San Francisco, California. In Europe, Valie Export's groundbreaking video