| 1968-1976 | Biologie, Karl-Franzens-Universität, Graz |
| 1974-1977 | Assistant, Institute for Zoology |
| 1973-1976 | Ph.D. thesis with Prof. K. Hagmüller, Intestinal Transport of Amino Acids in Rats |
| 1976 | Ph.D, Zoology and Biochemistry |
| 1977-1988 | Assistant Professor |
| 1984-1996 | Chairman, Commission for the Studies of Biologie and Earth Sciences |
| 1984-2014 | Lecturer at the department of Psychology Nutrition, Evolution, Anthropology. |
| 1988 | Habilitation, Zoology, Metabolic Physiology of the honeybee in dependence on the season |
| 1988-1997 | Associate Professor, Graz |
| 1991 | Sabbatical, University Illinois, USA, NIH-supported |
| 1996-2001 | Chairman, German section, IUSSI, Internationale Union zum Studium der sozialen Insekten |
| 1995 | Research, University of California, Riverside |
| 1997 | Appointment as University Professor, Full Professor, Karl Franzens Universität, Graz |
| Head, Division for Metabolic Physiology |
| 1998 | Research, University of California, Riverside |
| 1998-2003 | Dean, Faculty of Science, Karl-Franzens-Universität, Graz |
| 2001-2003 | Vice Chairman, Senate of the Karl-Franzens-Universität, Graz |
| 2003 | Vice Chairman, Convent of the Karl-Franzens-Universität, Graz |
| 2004-2007 | Member of the Senate of the Karl-Franzens-Universität, Graz |
| 2005 | President, Standing Commission of Apimondia, Bee Biology |
| 2006-2007 | Chairman of the Scientists´ Council of the Karl-Franzens-Universität, Graz |
| 2007 | Dean, Faculty of Science, Karl-Franzens-Universität, Graz |
| 2007-2011 | President, Styrian URANIA, Adult Education Centre |
| 2009-2013 | President, Austrian Entomological Society |
| 2011 | Vice President, Styrian URANIA, Adult Education Centre |
