1988 | Fryder & Partner Architects Office |
1989 | Saalbach Architects Office |
1990 - 1991 | Freelance work for S. Frenzen Architects Office |
1992 - 1997 | Partnership with S. Frenzen und T. Rettinger |
| Office: Frenzen & Partner |
1997 / 1998 |
Trading under the
new name ARK GbR - Partnership with T. Rettinger |
1999 / 2007 |
Safety and health
protection coordination |
2006 |
Vocational training
for energy consulting |