• Company founder
    Torsten Stiehm

    is the head and heart of Stiehm Ingenieurplanung GmbH. After studying Aerospace Engineering at the TU Berlin, this engineer soon successfully invested his technical knowledge and commitment in technical building equipment and founded his engineering company in the centre of Berlin in the year 2000. In addition to his technical expertise, he is primarily distinguished by his skill in finding and implementing simple solutions to complex subjects in building technology, taking into consideration the architecture and construction of the building. He places great value on technical and personal development for himself and his colleagues.


  • Yvonne Seeger

    has been employed as the commercial manager at Stiehm Ingenieurplanung GmbH since June 2013. After gaining more than 15 years of professional experience in the field of property management, this skilled businesswoman and management expert has extensive knowledge of the industry. Her work focuses on business development, cost control, personnel management and personal and individual customer support. Furthermore, she has successfully introduced and built up the E-TAM field of business within the company.

  • Raik Witthuhn

    has been associated with Stiehm Ingenieurplanung GmbH for over 10 years, initially as a freelance employee and, since August 2011, as a permanently employed project manager. The work of this graduate engineer in supply engineering and energy technology focuses on planning and site management in the fields of heating, ventilation and sanitation, as well as cooling technology.