I am a mathematics education consultant at the Quality School Improvement Project of the Hong Kong Institute of Educational Research, The Chinese University of Hong Kong (https://www.fed.cuhk.edu.hk/qsip/?lang=en). I support mathematics teachers in primary and secondary schools, and GeoGebra is the most important tool I use to support them. I was the Chairman of GeoGebra Institute of Hong Kong (www.geogebra.org.hk) from 2012-2022.