FAKT as a name represents the aim of finding a clear, defining answer to each project. We are interested in architecture as the possibility of making definite projects. As a growing team of architects, we share the strong will to build houses, objects and ideas. Our projects are approached with a consideration of system, reference, place and precedent.
FAKT was founded in 2013 and is run by Sebastian Kern, Martin Tessarz and Jonas Tratz. All founding partners studied together at certain times and collaborated in several offices before founding their own practice. The Berlin-based office is working on a broad range from small-scale furniture to construction projects as well as academic work. In 2019 FAKT and its founders received the prestigious one-year fellowship of the German Academy Rome “Villa Massimo”.
FAKT
Nicolaistraße 8
D – 12247 Berlin
tel +49 (0)30 560 400 20
mail
mail@fakt-office.com
social media
Instagram
jobs / internships
unsolicited internship or job inquiry emails can unfortunately not be answered, due to the frequent requests.
spontaneous applications (10MB max.) may be sent to
jobs@fakt-office.com
(c) 2025
FAKT – Office for Architecture
Kern Tessarz Tratz Architekten PartG mbB
CURRENT TEAM
Sebastian Kern, Martin Tessarz, Jonas Tratz, Stine Hahnel, Julian Brack, Muriel Werthebach, Pascal Henle
SEBASTIAN KERN, M.Sc. ETH Arch.
Sebastian Kern, born in Berlin 1988, is one of three managing partners of FAKT. He studied architecture at TU Berlin and at the Swiss Federal Institute of Technology (ETH Zurich). He was able to achieve working experience by interning and working on a freelance basis for several Berlin based offices. In 2012 he worked as a student assistant for the chair of Emanuel Christ and Christoph Gantenbein at ETH Zurich. In 2013 Sebastian Kern got his diploma thesis from a final project with Peter Märkli and was one of the co-founders of FAKT. He was recipient of the fellowship at the German Academy “Villa Massimo” in Rome (2019-2020). He is registered in the Architektenkammer Berlin and member of the Bund Deutscher Architektinnen und Architekten BDA.
MARTIN TESSARZ, M.Sc. ETH Arch.
Martin Tessarz, born in Erfurt in 1986, is one of three managing partners of FAKT. He studied architecture at TU Berlin and at the Swiss Federal Institute of Technology (ETH Zurich). After work experience in several Architecture offices in Berlin, Amsterdam and Los Angeles, including Staab Architekten, Johnston Marklee and Wiel Arets Architects, he worked as a researcher at the ETH FutureCitiesLab in Singapore. In 2013 he was one of the co-founders of FAKT. In parallel he was teaching as professor assistant at Uni Kassel, 2015-18 for the chair of Prof. Georg Augustin and at the Technical University of Berlin for the chair of Prof. Kampshoff (2018-2019). He is recipient of the fellowship at the German Academy “Villa Massimo” in Rome (2019-2020). He is registered in the Architektenkammer Berlin and member of the Bund Deutscher Architektinnen und Architekten BDA.
JONAS TRATZ, M.Sc. Arch.
Jonas Tratz, born 1988 in Berlin, is an architect, researcher, and university teacher, and one of the three managing partners of FAKT. Before founding the office in 2013, he studied Architecture at TU Berlin, at EAPLV Paris, and at the École polytechnique fédérale de Lausanne (EPFL), and gained professional experience at the Chair of Typology (Prof. Finn Geipel) as well as in several architecture offices, including Mila/Jakob Tigges and LIN. He has held various teaching positions and visiting professorships. He was Guest Professor at the University of Trento (Chair of Excellence “Adalberto Libera”). In 2024–25 he served as Interim Professor at DIA Dessau / Hochschule Anhalt, where his academic focus lay on post-typological thinking and types of transformation. He has also taught or guest lectured at institutions including MSA Münster, NSoA Beersheva, University of Siegen, TU Berlin and Paris-Est. Jonas Tratz is a recipient of the Rome Prize / prestigious fellowship of the German Academy “Villa Massimo” in Rome (2019–2020). He is co-author of Berlin Maps (2021), an atlas exploring spatial and geographic structures of Berlin. He is registered in the Architektenkammer Berlin, where he is an active member of the “Ausschuss Wettbewerbe und Vergabe”, and is also a member of the BDA, Bund Deutscher Architektinnen und Architekten.
STINE HAHNEL, M.Sc. Arch.
Stine Hahnel graduated in architecture from RWTH Aachen and complemented her studies with an academic exchange at EPFL Lausanne. During her time at RWTH, she also worked at the Chairs of Housing and Urban Design. Prior to her academic studies, she came from a background in vocational training as a draftsperson (Bauzeichnerin). Her professional experience includes positions in Munich, in Rotterdam at Atelier Kempe Thill, and freelance collaborations with Baukreisel. Since 2023 she has been part of the team at FAKT. With a strong interest in engaging meaningfully with existing buildings, her focus lies on projects in the field of transformation and re-use.
JULIAN BRACK, MA Arch.
Julian Brack studied architecture at TU Berlin and completed his Master’s at the Royal College of Art in London, where he wrote his dissertation Financial Algorithms and the City, which examined the spatial consequences of financialization. His professional experience includes positions in Paris (Bruther), London (Forensic Architecture), and Berlin. In his former roles, he investigated social and spatial phenomena using film, 3D scanning, gaming engines, and data-driven tools. Within his architectural work, he explores open, socially engaged forms and inventive approaches across scales, all framed by a critical, research-driven practice.
FORMER TEAM
Oksana Chebina, Fabian Röntgen, Till Bäumer-Kern, Maša Mori, Alessia Begnamini, Fynn Münker, Francesco Lovato, Gala Santina Brescia, Frieda Lübke, Simon Ibald, Nick Fimpel, Michael Olufemi Akpele, Costanza Eboli, Leonard Kaupp, Luis Druschke, Hanna Kosharna, Dorothea Velde, Manon Coppens, Miguel Jiménez, Helene Peters, Nora Zoppi, Oliver Alunovic, Rodrigo del Castillo, Jolene Lee, Claudia Borroni, Polina Moskalenko, Max Linnenschmidt, Esteban Lamm, Johanna Grau, Cecilia Ambrois, Sebastian Weindauer, Francelle Cane, Adeline Chimento, Stella-Marie Krex, Giulia Albarello, Mara Nuyens, Fabian Pfitzinger, Loukia Lhomme
Sebastian Ernst, as one of the four co-founders of FAKT, was fully involved in all works of the office from 2013 to 2019.
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