Tellervo Kalleinen (FIN) and Oliver Kochta-Kalleinen (DE) is a Helsinki based artist duo working on cinema, installation, events and reality games. They are initiators of a wide range of participatory projects such as the Complaints Choir concept, which has spread all around the world since 2005 up to date. They have exhibited in venues including Mori Art Museum (Tokyo), P.S.1 (New York), Shedhalle (Zürich), Kunsthalle Fridericianum (Kassel), KUMU (Tallinn), KIASMA (Helsinki), S.M.A.K. (Gent) and Ars Electronica Center (Linz).
Their film works have been shown in screenings of Hot Docs (Toronto), Rome Film Festival (Rome), Doc Point (Helsinki), New Media Festival (Tokyo), Kino der Kunst (Munich) and MoMa (New York). They are founding members of The Speech Karaoke Action Group and YKON. In 2012 they won AVEK media art prize and in 2014 they won the prestigious Ars Fennica. In 2017 they work as visiting professors at the Helsinki Academy of Fine Arts.