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*2007 Invited Guest Professor at Centro de Estudios de Postgrado y de Investigación en Educación Superior, Universidad Mayor de San Andrés, La Paz (Bolivia)
 
*2007 Invited Guest Professor at Centro de Estudios de Postgrado y de Investigación en Educación Superior, Universidad Mayor de San Andrés, La Paz (Bolivia)
 
*2004 - 2010 University Professor for Mathematics Education, Department of Educational Science, [[Universität Hamburg]]
 
*2004 - 2010 University Professor for Mathematics Education, Department of Educational Science, [[Universität Hamburg]]
*2004 Invited Guest Professor at Department of Mathematics, Johann Wolfgang [[Goethe-Universität Frankfurt]]
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*2004 Invited Guest Professor at Department of Mathematics, Johann Wolfgang [[Universität Frankfurt|Goethe-Universität Frankfurt]]
 
*2002 Habilitation at Department of Educational Science and Psychology, [[Freie Universität Berlin]]
 
*2002 Habilitation at Department of Educational Science and Psychology, [[Freie Universität Berlin]]
 
*2001 - 2002Guest Professor at Department of Educational Science, Universidad Metropolitana de Ciencias de la Educación, Santiago de Chile
 
*2001 - 2002Guest Professor at Department of Educational Science, Universidad Metropolitana de Ciencias de la Educación, Santiago de Chile