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- Technical University Graz
- Since 1992: “Zivilingenieur” (Patent Engineer), registered Consulting Engineer

- 1982 – 1989: Office “Ingenieurbüro Lässer-Feizlmayr – ILF”
- 1989 – today: „IGT Geotechnik und Tunnelbau“
Nejad Ayaydin Andreas Leitner Christian Kitzler
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