Helen Drury is an experienced teacher and government advisor on curriculum and assessment, Helen founded the first Ark Curriculum Plus programme, Mathematics Mastery – empowering teachers through curriculum and professional development in more than 500 schools nationwide. Helen holds a PhD in education, has written several books on teaching and the principles of mastery and is a member of the Royal Society’s Advisory Committee on Mathematics Education. She leads curriculum design for Ark Curriculum Plus, whose complete curriculum programmes empower teachers to help every child achieve subject mastery.