It was held ICME9(Tokyo 2000) at Makuhari-Messe in Chiba pref. from 31th of July to 6th of Aug.. It was the conference that teachers and researchers over the world, who deal with mathematics education, attended there. There were many lectures by famous reseachers and many reports about theoretical research and practical ones. Hearing these reports, I thought, the level of Japanese mathematics education is very high. Especially, it seemed that practical research on the base of lesson research has high quality of values to introduce mathematics educators over the world. And so, I will introduce Japanese teachers and their works who have led and contributed to Japanese elementary mathematics education so much.

1.Katsuro Tejima; former: Teacher of the elementary school attached to the 
                                  University of Tsukuba                                           
                        previous: Assistant professor of the educational university of  
                                   Joetsu                                    
                        present: Professor of the University of Seitoku

2.Kozo Tsubota; former: Teacher of the Fukazawa Elementary School in Tokyo
                        previous: Teacher of the Matsubara Elementary School
                        present:  Teacher of the elementary school attached to Tsukuba
                                    University