After the completion of her college, Marianne Mostert studied as a graduate textile designer at the "Academy of Fine Arts" (Akademie der Bildenden Künste) in Munich, where she worked as a master student of Rudi Tröger, receiving her diploma in 1975. Since then, she is a freelance artist in Weißenhorn in the swabian district of Neu-Ulm. Her works have been exhibited in numerous solo exhibitions (including in Ulm, Ravensburg, Bonn-Bad Godesberg, Essen, Munich, Augsburg), as well as public collections such as the State Art Collection in Munich, Ulm Museum, the Ministry of Stuttgart, the regional council of Tübingen and many others own them.