Sinan Olkun teaches in the elementary education department at Ankara University in Ankara, Turkey. He holds an Ed.D in Elementary Education with an emphasis on Mathematics Education from Arizona State University and an MS in Educational Sciences from Middle East Technical University, Turkey. He teaches introductory math and mathematics methods classes at graduate and undergraduate levels. His research interests include students mathematical, especially geometric, thinking and learning at K-8 grades.

Zulbiye Toluk teaches in the elementary education department at Abant Izzet Baysal University in Bolu, Turkey. She holds an Ed.D in Elementary Education with an emphasis on Mathematics Education from Arizona State University and an MS in Mathematics Education from Middle East Technical University, Turkey. She teaches mathematics and mathematics methods classes at graduate and undergraduate levels. Her research interests include students mathematical thinking and learning at K-8 grades.