1971-1979 Work for the Graz Research Center in the fields program design for road construction, operating systems and terminal handling.
1974-1984 Assistant professor at Graz University of Technology.
1979 Leave at Sperry Univac (Roseville, MN, USA). There the main topic he worked on was lower layer design for local area networks.
1984 Approved as Lecturer ("Habilitation") for "Applied Information Processing and Information Technology".
Since 1984 Full Professor. "Applied Information Processing and Communications".
Since 1986 Head of the Institute of Applied Information Processing and Communications Technology at the Graz University of Technology.
Since 1999 Scientific director of the Austrian Secure Information Technology Center (A-SIT), a non-profit organization performing technical control of electronic signatures according to the Austrian electronic signature law.
Since 2001 “Chief Information Officer” for the Federal Republic of Austria.
