Lez gained his Graduate Certificate of Science Education (GCSE) in 1969 at The Centre for Science Education, Parsons Green, which later became incorporated into King’s College.

He started out teaching Science in Battersea and went on to schools in Peckham, Philadelphia, Sao Paulo, Putney and St. John’s Wood. After 32 years he retired from full time teaching and moved to teaching Psychology (International Baccalaureate) part time in Barnet while at the same time tutoring on the PGCE course at King’s, which he has greatly enjoyed since 2004.