Archives Otto Muehl represents and maintains the collection of the artist’s foundation. This collection includes works from 1937 until 2019: oil and acrylic paintings, aquarelles, drawings, silkscreen prints, objects, actions, photos, films, texts and music. Moreover, the Archives Otto Muehl is the only organization authorized by the artist to proof the authenticity of his works.
The collection was compiled under Theo Altenberg in the 1980s by the Aktions-Analytische Kommune (Action Analytical Commune) of Otto Muehl and introduced to a cooperative after the end of the Commune in 1990. The Sammlung Friedrichshof currently owns the most extensive private collection of works by Vienna Actionism artists from the 1960s and early 1970s. In addition, the collection contains ca. 5000 works by Otto Muehl from 1946 until 1991.