| 1991 - 1996
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Studies of Mathematics and Chemistry (Lehramt an Gymnasien) at the University of Oldenburg
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| 1996
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Degree: 1. Staatsexamen Lehramt an Gymnasien, Thesis (Staatsexamensarbeit): Kantenmorphismen von Graphen und Hypergraphen [Edge morphisms of graphs and hypergraphs]
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| 1997
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Start of my Ph.D project in graph theory/algebraic combinatorics. Advisor: Prof. Dr. Dr. h.c. Ulrich Knauer
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| March 1998
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Staff member in the research group for Mathematics Education (Prof. Dr. Kristina Reiss), University of Oldenburg
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| Spring 2000
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Two-month research stay at the Ben-Gurion-University of the Negev in Beer-Sheva, Israel (DAAD-Ph.D scholarship). Advisor: Prof. Dr. Mikhail Klin
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| June 2001
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Ph.D in mathematics (Dr. rer. nat.), title of the thesis: Applications of Schur Rings in Algebraic Combinatorics: Graphs, Partial Difference Sets and Cyclotomic Schemes
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| October 2002
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Assistant professor (wiss. Assistent) at the Chair of Mathematics Education, University of Augsburg
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| November 2002
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Gerhard Wachsmann award from the University of Oldenburg for the best thesis in 2001
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| February 2003
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Dissertation award (Weser-Ems-Wissenschaftspreis 2002)
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| October 2005
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Assistant professor (wiss. Assistent) at the Chair of Mathematics Education, University of Munich
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| December 2005
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Habilitation (postdoctoral thesis) on proving in mathematics and in Mathematics Education. Title:"Beweisen in der Mathematik und im Mathematikunterricht: Zum Erlernen einer grundlegenden mathematischen Tätigkeit" (Proving in mathematics and mathematics instruction: Learning a fundamental mathematical activity)
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| January 2006
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Postdoctoral lecture qualification and appointment as private lecturer at the University of Munich, venia legendi for Mathematics Education
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| July 2007
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Elected as a member of the International Committee of the International Group for the Psychology of Mathematics Education (PME) at the PME conference in Seoul (South Korea)
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| October 2007
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Professor for Mathematics Education at the University of Regensburg
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| May 2008
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Head of the new Department of Mathematics Education at the Leibniz Institute for Science Education (IPN) Kiel and Professor for Mathematics Education at the University of Kiel
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