Dagmar Keller (1972 born in Germany) and Martin Wittwer (1969 born in
Switzerland) both studied at the Academy of Fine Arts Düsseldorf and Dagmar also at the Academy of Media Arts Cologne. They have collaborated together as an artist duo since 1997, creating extensive photographic cycles, film and video installations.
The artist duo has presented its artworks in numerous solo and group exhibitions, at festivals and venues such as transmediale, Berlin (GER, 2002), Argos Arts Centre, Brussels (BEL, 2002), Nicolaj Contemporary Art Center , Copenhagen (DEN, 2002), Taipei Fine Arts Museum, (TRE, 2003),
Migros Museum für Gegenwartskunst, Zürich (SUI, 2003), hmkv Hartware MedienKunstVerein, Phoenixhalle, Dortmund (GER, 2004), sonar, International Festival of Advanced Music and New Media Art, sonarmatica at MACBA, Museum of Contemporary Art, Barcelona (Esp, 2005), Kunstmuseum Thun, (SUI, 2007), BACC, Bangkok Art and Culture Centre, Bangkok, (THA, 2008), Optica, Centre for Contemporary Art, Montreal (CAN, 2009), Württembergischer Kunstverein, Stuttgart (GER, 2010), Photoforum PasquART, Biel-Bienne (SUI, 2013), Triennal for Contemporary Art, Valais (Sui, 2013), Kunstmuseum Bonn (GER, 2016), Oldenburger Kunstverein (GER, 2017), Kunsthalle Nürnberg (GER, 2018), Ludwig Forum Aachen (GER, 2020/21) and Kunstmuseum Thun (CH, 2024)

Their photo books Passengers (2013) and POINT DE DÉPART (2016) have been published with with Spector Books.