Yiming Cao is a professor of Mathematics Education in the School of Mathematical Science at Beijing Normal University, China. He is the deputy director of Basic Education Commission of Chinese Mathematical Society and the chair of Chinese Association of Mathematics Education. His research areas include mathematics curriculum and teaching, the history of mathematics and teacher education. He has published more than 100 papers in the academic journals and more than 30 books in these areas. And he undertaken several international cooperation project and key projects of national level. Furthermore, he is a member of the editorial board of Journal of Mathematics Education in America and the associate editor of Journal of Mathematics Education in China. Besides, he was invited as visiting research fellow and gave lectures in many countries, such as Australia, Japan, Brazil, America, Malaysia and so on. He was invited to present reports on the 11th International Congress on Mathematics Education and the 34th International Congress on Psychology of Mathematics Education etc. which were the significant international academic conference. And he was in charge of organizing the 14th Asian Technology Conference in Mathematics. Frederick Koon-Shing Leung is Chair Professor and Kintoy Professor in Mathematics Education at the University of Hong Kong, and was Dean of the Faculty between 1996 and 2002. Professor Leung’s 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 principal investigator of a number of major research projects, including the Hong Kong component of the Trends in International Mathematics and Science Study (TIMSS), the TIMSS Video Study, and the Learner’s Perspective Study (LPS). Professor Leung is one of the editors for the Second and Third International Handbooks on Mathematics Education published by Springer, a member of the editorial boards for a number of major journals in mathematics education, and was a member of the Executive Committee of the International Commission on Mathematical Instruction (ICMI) between 2003 and 2009. He was appointed a Senior Fulbright Scholar in 2003, and was awarded the Hans Freudenthal Medal for 2013 by ICMI. He was named a Changjiang Scholar by the Ministry of Education, China in 2014, he received the World Outstanding Chinese Award in 2015, and was awarded a Bronze Bauhinia Star (BBS) by the Hong Kong SAR Government in 2017. He is also an honorary professor of Beijing Normal University, Southwest University and Zhejiang Normal University in China.