Dear colleagues, we are pleased to invite you to the upcoming “Educating the Educators III” conference (ETE III) on approaches to scaling-up professional development in maths and science education. We expect about 200 researchers, policy-makers and practitioners from around the world. The conference will take place on October 7-8, 2019 at the University of Education in Freiburg, Germany. The registration is now open on https://icse.eu/educating-the-educators-iii/. Early bird registration is open till 4th June 2019.