Jill Adler holds the SARChI Mathematics Education Chair at the University of the Witwatersrand, which focuses on research and development in secondary mathematics education, and is the 2017-2020 President of the International Commission on Mathematical Instruction (ICMI). Jill has spearheaded several large-scale teacher development projects, the most recent, within the Chair ambit, begun in 2009, is called the Wits Maths Connect Secondary project. This work builds on her research on teaching in multilingual classrooms, and teacher professional development. Jill is a Visiting Professor of Mathematics Education at King’s College London, UK. She is the recipient of numerous awards, the most significant of which are the 2012 Academy of Science of South Africa (ASSAf) Gold Medal for Science in the Service of Society, and the 2015 Freudenthal Award.