Nina Kovacheva (1960 – Sofia) and Valentin Stefanoff (1959 -Sofia).

Nina and Valentin have lived and worked together for several decades. During this time, they have created both individual and joint works. Often, art critics speak of them as three artists: Nina, Valentin, and Nina & Valentin or ninavale. Nina and Valentin create numerous video and video installations designed for museum facades, public buildings and other public spaces. Among them is “In the Out” (2002), a video installation shown at the 4th Biennial of Contemporary Art in Cetine, Montenegro, for which they were awarded The UNESCO, 2002, Prize for the Promotion of The Arts. In 2005, they create ”Phases of Accumulation and Extraction in a Limited Space”, a video installation designed for the facade of the National Gallery, Sofia, it was the first of this type art intervention in a public place in Bulgaria. ninavale’s video instalations and side spesific works are shown at: Sofia Arsenal – Museum of Contemporary Art / City Art Gallery, Sofia / MOCA Taipei, Taiwan / Jeju Museum of Art, South Korea / The National Gallery of Art, Skopje / Arossita Gallery, Sofia  / National Art Gallery, Sofia / Dartington College of Arts, UK / Nanjing Shenghua Arts Center, China / Kunsthalle Hannover / Zendai MoMA, Shanghai / Duolun Museum of Modern Art, Shanghai / Macedonian Museum of Modern Art, Thessaloniki / National Academy of Fine Arts, Sofia / ZONE: Chelsea Center for the Arts, New York / Museum of Contemporary Art Detroit / MNAC, Bucharest / Musée d’Art Modern et Contemporain, Strasbourg / Nuit Blanche, Paris and many others.