| SANDOZ, Kundl, Austria | 2008 - 2009 |
| TESSA, Procter & Gamble, Turkey | 2004 |
| Aquachemia Žilina, Slovakia | 2002 |
| SC Johnson Polymer, Netherland, USA | 1999 |
| Chemie Linz, Austria | 1994 - 1996 |
| Chemie Linz, Austria | 1995 |
| Biochemie Kundl, Austria | 1995 |
| Biochemie Kundl, Austria | 1993 |
| Chemie Linz, Austria | 1992 |