Mark is the UK's leading authority on teaching for mastery. He has trained over 2,000 schools in mastery models for schooling. A leading figure in mathematics education, Mark has led many large-scale government education initiatives, both in the UK and overseas. Mark was a Director at the National Centre for Excellence in the Teaching of Mathematics (NCETM) and has also been a school leader, an Advanced Skills Teacher, a school inspector and a teacher trainer. He founded and was Chairman of the Teacher Development Trust. Mark has extensive experience in mathematics teaching and learning across all age and ability groups, having taught students from age 3 to Ph.D.