The story
The company was created in 1979 by Gunter Henn in Munich and is the successor to the company of Walter Henn, who was still active as an office partner until 1989 (Henn + Henn Architekten). The company has been operating as Henn GmbH since 2013. Since 2021, Gunter Henn has been a member of the company's advisory board.
From Wikipedia’s article on Henn GmbH, shared under CC BY-SA 4.0.5