STEM Teacher Training Network of the Netherlands

In Memoriam

// Basisonderwijs // Kort

In Memory of Adri Treffers

Op de trappen bij Utrecht Overvecht, leunend op een rekenrek. It is with sadness that we learned of the passing of Prof. Adri Treffers (June 22, 1935 – January 6, 2026). Treffers was professor of domain-specific educational theories for arithmetic and mathematics at Utrecht University from 1989 to 1998. His vision on arithmetic and mathematics…