| 2008 | Full Professor of Pathology of the Department of Pathology of the Medical University, Graz, Austria |
| 1983 -2008 | Full Professor of Pathology and chairman of the Department of Pathology of the University of Graz School of Medicine (now Medical University), Graz, Austria |
| 1977 -1982 | Professor of Pathology and Vice-Chairman of the Department of Pathology of the University of Vienna School of Medicine |
| 1976 | Associate professor (Habilitation) (Pathologic Anatomy) at the University of Vienna School of Medicine |
| 1974 -1975 | Visiting Professor and Fulbright Scholar at the Department of Pharmacology of Yale University School of Medicine, New Haven, Connecticut, USA |
| 1973 | Associate professor (Habilitation) (General and Experimental Pathology) at the University of Vienna School of Medicine, Vienna |
| 1971 -1982 | Head of the Laboratory of Gastroenterologic Pathology and Molecular Pathology (Hans Popper Laboratory) at the Department of Pathology of the University of Vienna School of Medicine |
| 1969 -1971 | Postdoctoral Research Fellow of the NIH (Bethesda, USA) at the Department of Pathology of the Mount Sinai School of Medicine of the City University of New York, N.Y. |
| 1967 -1969 | Assistant at the First Department of Internal Medicine of the University of Vienna School of Medicine |
| 1964 | M.D. degree ("Sub auspiciis praesidentis rei publicae") of the University of Vienna School of Medicine |
| 1964 -1967 | Assistant at the Department of General and Experimental Pathology, University of Vienna |
| 1958 -1964 | University of Vienna School of Medicine |
| 1999 | Österr. Ehrenzeichen für Wissenschaft und Kunst |
| 1994 | Kardinal-Innitzer-Würdigungspreis |
| 1991 | Lucie Bolte Preis der German Association for the Study of the Liver (GASL) für besondere Verdienste auf dem Gebiete der Leberforschung |
| 1991 | Wirkliches Mitglied der Österreichischen Akademie der Wissenschaften |
| 1974 | Sandoz Preis für Medizin |
| 2009 -2010 | Österreichische Akademie der Wissenschaften Präsident |
| 2003 -2010 | Kurie Wissenschaft des Österreichischen Ehrenzeichen für Wissenschaft und Kunst Vorsitzender |
| 2001 -2010 | Christian-Doppler-Forschungsgesellschaft Senatsmitglied |
| 2000 -2010 | European Society of Pathology Member of advisory council |
| 2000 -2010 | Europäisches Forum Alpbach Kuratoriumsmitglied |
| 2000 -2010 | Österreichische Krebshilfe Steiermark Ehrenmitglied |
| 1998 -2010 | Deutsche Akademie der Naturforscher Leopoldina Senator |
| 1996 -2010 | Royal College of Pathologists Fellow |
| 1991 -2010 | Mathematisch-naturwissenschaftliche Klasse der Österreichischen Akademie der Wissenschaften Wirkliches Mitglied |
| 2003 -2008 | Wissenschaftlicher Ausschuss der Gentechnikkommission für Genanalyse und Gentherapie am Menschen Mitglied |
| 2000 -2008 | Institut für biomedizinische Altersforschung der Österreichischen Akademie der Wissenschaften Vorsitzender |
| 2000 -2007 | Österreichische Gesellschaft für Pathologie Vorstandsmitglied |
| 2001 -2005 | Joanneum Research Beiratsmitglied |
| 2000 -2005 | Oberster Sanitätsrat Ordentliches Mitglied |
| 2000 -2009 | VIRCHOWS ARCHIV-AN INTERNATIONAL JOURNAL OF PATHOLOGY |
| 2007 -2009 | GASTROENTEROLOGY |
| 2000 -2008 | HUMAN PATHOLOGY |
| 2000 -2008 | INTERNATIONAL JOURNAL OF CANCER |
| 2008 -2008 | BRAIN RESEARCH BULLETIN |
| 2008 -2008 | CLIN GASTROENTEROL |
| 2008 -2008 | GUT |
| 2008 -2008 | MOLECULAR GENETICS AND METABOLISM |
| 2000 -2007 | EUROPEAN JOURNAL OF GASTROENTEROLOGY & HEPATOLOGY |
| 2000 -2007 | JOURNAL OF HEPATOLOGY |
| 2000 -2007 | PATHOBIOLOGY |
| 2007 -2007 | ALIMENTARY PHARMACOLOGY & THERAPEUTICS |
| 2007 -2007 | EXPERIMENTAL AND MOLECULAR PATHOLOGY |
| 2007 -2007 | JOURNAL OF CELL BIOLOGY |
| 2007 -2007 | WIENER KLINISCHE WOCHENSCHRIFT |
| 2000 -2006 | CELL AND TISSUE RESEARCH |
| 2000 -2006 | EXPERIMENTAL GERONTOLOGY |
| 2000 -2006 | HEPATOLOGY |
| 2000 -2006 | PATHOLOGE |
| 2000 -2005 | LIVER INT |
| 2000 -2009 | Christian Doppler Gesellschaft - Austria |
| 2000 -2009 | Joanneum Research - Austria |
| 2000 -2009 | Österreichische Akademie der Wissenschaften - Austria |
| 2000 -2009 | Deutsche Forschungsgemeinschaft - Germany |
| 2000 -2008 | Novartis Stiftung - Austria |
| 2000 -2008 | Aventis Stiftung - Austria |
| 2008 | 3rd Intercontinental Congress of Pathology; Slide seminar (SS12): Cholestasis and bile duct diseases Organisator |
| 2007 | Herbsttagung der Österr. Gesellschaft für Pathologie und IAP Austria,
Sitzung "Hereditäres Colonkarzinom" Chair |