[phase eins].

[phase eins]. is a Civil Law Association (GbR) founded in 1998 and headed by the two partners Benjamin Hossbach and Christian Lehmhaus.

The office permanently employs approximately twenty staff members. During examination periods the team grows to 30 employees; these temporary co-workers are recruited from a pool of experienced examiners and students to form the pre-examination team.
Benjamin Hossbach

Benjamin Hossbach, Dipl. Ing. Architect BDA
  • born in 1966, Darmstadt
  • 1990-1995 National Contact Germany of the European Architecture Students Assembly (EASA): conception of annual international student workshops, each with approx. 500 participants
  • 1995 graduated in architecture at Technical University of Berlin
  • since 1995 independent architect
  • since 1995 pre-examiner in various competition procedures
  • 1996-1998 online editor of "Bauwelt", Germany's leading architecture journal
  • 1998 founding partner of [phase eins].
  • since 2000 member of the Berlin Chamber of Architects (No. 09759)
  • since 2000 member of the BDA Berlin (Federation of German Architects)
  • 2009-2014 Deputy spokesman of the Committee of Foreign Affairs in the BDA Germany
  • 2011-2013 and 2017-2021 Member of the board for competitions (LWA) at the Berlin Chamber of Architects
  • publications, lectures and teaching activities (i.a. ETH Zurich, Harvard GSD, Lund TH, Vienna academy of art, Bauhaus University Weimar and UNESCO Habitat conference Tripoli) and juror in international design competitions
  • architectural juror in national and international design competitions
  • languages: German, English, French, Swedish
Christian Lehmhaus

Christian Lehmhaus, Dipl. Ing. Architect VBI
  • born in 1963, Bielefeld
  • 1993 received degree in architecture from Technical University of Berlin
  • 1993-1996 employed as an architect
  • 1996-2001 project developer and project controller
  • since 1996 publications, teaching activities and lectures
  • since 2001 partner at [phase eins].
  • since 2002 member of the Berlin Chamber of Architects (No. 10545)
  • 2008-2010 Professor at Bochum University of Applied Sciences
  • member of the German Association of Consulting Engineers (VBI)
  • languages: German, English