For many years, I have been involved in the support of mathematically talented high school students, on various levels:

• for the mathematical olympiad in Lower Saxony (since 2013)
• as a coach of the German team for the International Mathematical Olympiad (since 2020)
• in the problem selection committee and as a coordinator for the German Mathematical Olympiad (since 2022)

Over the years, I have written several notes for olympiad training (in German):

• Graphen (2025)
• Rekursionen und erzeugende Funktionen (2024)
• Ungleichungen (2023)
• Funktionalgleichungen (2022)
• Quadratisch, praktisch, gut: Aus der Zahlentheorie (2021)
• Die Teiler von x^n-y^n und x^n+y^n (2021)
• Zahlentheorie – Über Größe und Teilbarkeit (2020)
• Endliche Körper in der Zahlentheorie (2020)