Study experimental physics LeidenUniversity (1964-1971)

 Teacher of physics in secondary schools  in Amsterdam, Senanga (Zambia) en Leiden (1971-1979)

 Curriculum development in physics education, Free University of  Amsterdam (1975-1980): project Physics in Society

 Universiteit Utrecht (1981- present):

• Curriculum development in physics and science education

      (PLON 1981 - 1986, ANW 1994 – 1997, NLT 2005 - present)

• Science education research (PhD 1990: Radiation and Risk in Physics Education; curriculum issues; analysis PISA-results; supervising  eight PhD-studies)
• Professor of physics education (1997-2011)
• Involved in science education projects in Botswana (Pre-Entry Science), Tanzania (TEAMS), Ghana (PRACTICAL), Israel (water education), Portugal (Ciencia Viva) and worldwide (OECD and Science across the World)
• Head of the  Science and Mathematics Teacher Training Department (1991 –2001)
• Chair Centre for Science and Mathematics Education (1997 – 2003)
• Director of Education, Faculty of Physics and Astronomy (2003 - 2006)
• Vice-dean undergraduate studies, Faculty of Science (2005-2011)
• Director Freudenthal Institute for Science and Mathematics Education (2011- May 2014)
• Director Eijkelhof Science Education Advice (since 2014)