Dr Bradley has been associated with Montessori education for more than 20 years, initially working with training colleges to develop National Voluntary Qualifications, and recently inspecting Montessori schools and promoting inspectors' awareness of Montessori work.
Dr Bradley said of his appointment, 'To become chair of the MSA is an honour and I look forward to working with the schools and also trainers to promote Montessori work as well as wider awareness of Montessori methods.
This is an exciting time to join - the introduction of the Early Years Foundation Stage offers both challenges and opportunities at all levels.'
Philip Bujak, chief executive of Montessori St Nicholas Charity of which the MSA is a part, said, 'We advertised nationally for the post and Dr Bradley proved to be the outstanding applicant.
'His experience as an inspector, his knowledge of Ofsted, plus his sympathy, understanding and support for Montessori methods made him ideal.'