Päivi Perkkilä, (Ph.D., Adjunct Professor in mathematics education) is a Senior Lecturer in education (and in mathematics education) at the University of Jyväskylä in Finland. She is an experienced teacher and educator. Her research interests are mathematical thinking, languaging of mathematical thinking, learning materials in mathematics education, identity and view of mathematics in elementary teacher education. She has been a guest editor in mathematics education journals. Perkkilä has published several tens of peer-reviewed articles in her research areas. She acts as an editorial board member and a reviewer for several international journals.