Frederick Leung is Dean of Graduate School, and Chair Professor and Kintoy Professor in mathematics education at The University of Hong Kong. His major research interests are in the comparison of mathematics education in different countries, and in the influence of different cultures on teaching and learning. He is Editor for Springer’s 2nd and 3rd International Handbooks on Mathematics Education and a member of the Executive Committee of ICMI between 2003 and 2009.   Gloria Stillman is an Associate Professor of Mathematics Education at Australian Catholic University (Ballarat). She is a highly experienced Lecturer in primary, early childhood and secondary mathematics education. She has authored many publications on the teaching, learning and assessing of mathematical modelling. She is immediate past President of the International Community of Teachers of Mathematical Modelling and Applications and a former Vice President (Research) of the MathematicsEducation Research Group of Australasia. She is a member of the editorial boards of ZDM Mathematics Education and Mathematical Thinking and Learning.  Gabriele Kaiser is Full Professor of mathematics education at Faculty of Education, University of Hamburg. Her research includes modelling and applications in school. She is Editor-in-Chief of ZDM Mathematics Education. She was convenor of the 13th International Congress on Mathematics Education (ICME-13) in 2016 at the University of Hamburg with 3,500 participants. She is Current President of the International Community of Teachers of Mathematical Modelling and Applications (ICTMA).  Ka Lok Wong is Senior Lecturer in the Faculty of Education at The University of Hong Kong, involved in mathematics teacher education from undergraduate to master’s level. He plays a leading role in various professional development programmes funded by the government. He engages himself in a range of educational communities, including the presidency of Hong Kong Association for Mathematics Education. He was a member of the PISA research study in Hong Kong from 2006 to 2015.