Sarah Seleznyov is one of the founding Headteachers of School 360 and leads the Rethinking Schools project for Big Education. She has worked in London schools for over 25 years including as a School Improvement Consultant, Teaching School Director and Programme Leader at UCL Institute of Education, where she designed and led a range of programmes for school leaders. Sarah is a specialist maths tutor on the Let’s Think (Cognitive Acceleration) research project from King’s College University. Her research specialism is Japanese lesson study, and she has published widely on the use of lesson study outside Japan.