Iryna Sitak, born in 1969, received a Candidate of Pedagogical Sciences degree (PhD) from the National Pedagogical Dragomanov University, Ukraine, in 2018. Since 2002, she has been working in the field of mathematical and pedagogical modeling at The Institute of Chemical Technologies (the town of Rubizhne) of the East Ukrainian Volodymyr Dahl National University, where she is currently head of the Mathematics and Computer Technology. Her research interests include the issues of mathematics education. She has published a number of papers in international journals and volumes in book series. She is the editor and tutor of an open online educational platform Higher School Mathematics Teacher.