Katharina Seyferth worked since 1972 in German TV and Film productions as actress.1976 she was guest-auditor at Lee Strasberg’s Actor Studio and took actors-classes with Uta Hagen in NY at the HB-Studio. After working with Ryszard Cieslak in New York at the Manhattan Theater Project she went 1977 to the Theater Laboratory in Poland to participate in Jacek Zmyslowski’s Mountain Project. She was invited to join the Laboratory’s international group and worked as a member of the leading team in Vigil and the trans-cultural project Theater of Sources, directed by Jerzy Grotowski.
Since 2005 she works regularly as teacher in the professional training for actors of the Théâtre 2 l’acte in Toulouse. She creates the solo performance of Gertrud Stein’s text “Tender Buttons” in French, which she is performing in Las Téoulères and in Toulouse. She founds the Company K. and initiates the "Promenade Théâtral".
In 2006 she takes part as actress in the production of Thomas Bernhard’s Dramolettes under the direction of Isabelle Luchioni.
2009 (declared by the UNESCO as year of Grotowski) she is part of the project « Meetings with remarkable women » at the Grotowski Institute in Poland. At this occasion she leads a five day workshop for a group of 17 international participants and she presents her performance « Rooms » from « Tender Buttons » by Gertrude Stein in English.
2011 she develops and presents the performance "Time Travel" at the Théâtre 2l'acte in Toulouse. Realization with 16 students of the professional training program "Vers un acteur pluriel"
2012 she directs a workshop in Lyon and at the festival INFANT in Novi Sad, Serbia.
At the Rilke Festival in Sierre, Switzerland she presents the text "Notes on the melody of things"
In 2014 she works with the actors of the Hungarian national theater in Timisoara and directs a master class in Kelebija, Serbia.
2016 and 2018 Workshops with "Les Messieurs utopiques" a collective of Actors in Lyon.