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Senior Leadership Team

Dr Trevenna - Principal

Dr Trevenna joined the Academy in September 2015 as Head of School and was appointed Principal in June 2016. Having grown up in Bletchley, Dr Trevenna has a strong affinity with Sir Herbert Leon Academy and the community it serves. She is driven to ensure that Academy students are provided with opportunities to succeed in their education and beyond. Working with staff and students, Dr Trevenna is committed to raising educational standards and student aspirations at the Academy.

Dr Trevenna left school at 16 following her completion of GCSEs but returned to full-time education in her 20s. She graduated from De Montfort University with a first class degree in English in 1998 and obtained her PhD from the University of Hertfordshire in 2001. This experience of returning to education and experiencing first-hand the opportunities that further and higher education opens up, shapes her determination to encourage educational achievement and to challenge barriers faced by disadvantaged children.







Mrs Ainsworth - Vice Principal

Mrs Ainsworth joined the Academy in April 2014 as Vice Principal and lead practitioner for Teaching and Learning. She is passionate about students receiving quality experiences in and out of the classroom and being nurtured to achieve their full potential. Since April 2016, she has moved from leading Teaching and Learning to working within Standards, where she now works with staff to ensure that assessments are meaningful, purposeful and provide powerful indicators of students’ performance in their subjects and likely outcomes. Previous to her role at the Academy, Mrs Ainsworth worked at an all through (3-18 years) Academy in Daventry, East Northamptonshire as Assistant Principal for Teaching and Learning. Further to this role, she also led on new staff induction and Initial Teacher Training. Prior to senior leadership roles, Mrs Ainsworth was a Head of Science for four years. She firmly believes in students learning through doing and loves the practical application within her subject. Mrs Ainsworth graduated from Leicester University with a BSC (Hons) degree in Biology and Psychology and gained QTS (Qualified Teaching Status) through a school centred training programme.



Ms Causer - Vice Principal

Ms Causer joined the Academy in January 2016 as Director of Post 16 and was then subsequently promoted to Vice Principal in February 2017. She is determined that every student is able to achieve their potential through excellent pastoral care as well as giving opportunities for students to take part in an enriched curriculum to complement their chosen studies. Ms Causer also line manages the academy's excellent house system, the cover team, careers programme, SEN provision for the academy and attendance. Previous to her role at the Academy, Ms Causer worked at another Milton Keynes secondary school for 10 years where she was a successful Head of Faculty, leading on whole school initiatives.  Ms Causer graduated from De Montfort University, Bedford with a BA (Hons) degree in Sport Studies with English. Afterwards she completed her PGCE in secondary Physical Education. Ms Causer has also recently completed her NPQSL.



Mr James Toyer - Assistant Principal

Mr Toyer joined the academy in September 2016. After leaving school at 18, he spent the next two years travelling spending most of his time in Australia. He began his degree course as a mature student graduating from De Montfort University Bedford in 1998 having successfully completed his Bachelor of Education with honours. During his time working in secondary education, he has successfully adapted his practice to fit a number of roles. He has enjoyed the opportunity of being a teacher of Mathematics and PE; a Form Tutor; a Head of Year; a Head of Department, a Learning consultant and now works in the role of Assistant Principal at Sir Herbert Leon Academy.

In April 2015 he was selected by Apple to become an ‘Apple Distinguished Educator’. ADE’s are members of a handpicked community of education innovators who research, publish, advise and promote what is possible when new technology is used to enhance teaching and learning. It also gives him the opportunity to collaborate with colleagues around the globe and turn fresh, new ideas into education realities.

External contributions to support research by the youth sport trust have seen Mr Toyer's action research published in book and DVD formats. He has also been an external consultant for HarperCollins publishers for their 2010 GCSE Mathematics publications.


Ms Jennie Haddock - Associate Assistant Principal

Ms Haddock joined the Academy in January 2017 as strategic lead for Humanities and with responsibility for Key Stage 3 Teaching and Learning.  She is passionate about the importance of Key Stage 3 and keen to ensure a smooth transition from Primary School for all of our students.  Ms Haddock is especially skilled at facilitating active learning and ensuring effective differentiation for all.  Moving to the Academy brings her back to the town where she began her teaching career in 2003 at The Lord Grey School since then Ms Haddock has  led a successful Humanities department at The Buckingham School and co-ordinated behaviour for learning at The Radcliffe School.




Miss Stepney - Associate Assistant Principal

Miss Stepney joined the Academy in September 2016 as a Curriculum leader for English and with the responsibility for Pupil Premium students. Since leaving school she has never been out of education, going straight to university after her A-levels in English, Maths and Philosophy and Ethics. She went on to graduate with honours in English Literature before completing her PGCE. She is passionate about education and the difference it can make to individuals and she is dedicated to ensuring every child has opportunities to learn and grow. She came to the Academy from The Buckingham School where she led a very successful English department, moving the results from 51%  A-C to 86% A-C. She is determined to lead the Academy English department to the same success and to ensure equal opportunities and support for all students.