Senior Leadership Team

Annmarie McNaney - Headteacher

Annmarie has been the Headteacher at CGS since September 2015.  She joined the school as Head of Sixth Form in the late 90s before being promoted to Assistant Head and then Deputy Head, a role she held from January 2007 until her appointment as Headteacher.  During her time on the Senior Leadership Team, she has introduced several new initiatives and was the driving force behind 'CGS Learning', the school's bespoke approach to teaching and learning.  She was an integral part of the CGS journey from good to outstanding and is very proud of what was achieved in the process.  

Before moving to Chesham Grammar, Annmarie taught at Backwell School, a large, nine form entry comprehensive school just outside Bristol, where she was Assistant Head of Sixth Form.  Annmarie is a graduate of the University of Bristol where she read Theology and Sociology and where she also studied for her PGCE.  Annmarie lives in Berkhamsted and is married with two sons, both of whom joined CGS in year 7.  Both sons are now CGS alumni, the elder leaving in 2021, going on to a Degree Apprenticeship with UBS. The younger, a member of our Class of 2024, sat his A levels last summer and is now at Manchester University reading Economics.

Tim Patteson - Deputy Head

Tim joined Chesham Grammar School in September 2015 having been Subject Leader of Geography at Dr Challoner's Grammar School, Amersham for four years. Prior to that, he worked at Sir John Lawes School, a mixed comprehensive in Harpenden. His current role includes responsibility for teaching and learning as well as staff professional development. He is married with two young daughters and two sons.

Hugh Bradbury - Assistant Head

Hugh joined CGS in 2012.  Prior to becoming Assistant Head, Hugh was Subject Leader for History and before that, led the Politics Department. Hugh has performed a number of other roles within and beyond the school as More Able and Talented Coordinator and also as a Specialist Leader for Education for the ASTRA Alliance.  Within that role he worked closely with the ASTRA SCITT, in particular delivering the subject specific training to History trainees from across the Alliance.  His primary teaching subjects at CGS are History and Politics and his main responsibilities as Assistant Head are overseeing pastoral care and supporting the wellbeing of students as the Designated Safeguarding Lead, Designated Mental Health Lead and SENDCO.  Hugh grew up in Sussex and Surrey and then went on to complete his undergraduate degree and teacher training at the University of Exeter.  He now lives in Chesham.

Sebastian Hayes - Assistant Head

Seb joined CGS in 2018 as Subject Leader for History.  Seb started his working career on the John Lewis Graduate Development programme before changing careers and completing his teacher training at UCL.  Seb worked as Head of History in London and taught in Madrid before joining CGS.

In 2020 Seb took on the role of Associate Assistant Head and led the school's work on recovery following the pandemic. In 2021 he joined the team in an acting capacity before taking up a permanent position in September 2023. In his substantive role he leads on Teaching and Learning, Character Education and Student Leadership.

Simon Pearce - Assistant Head

Simon joined CGS in September 2024, taking on the role of Assistant Headteacher with responsibility for Data, Assessment and Digital Strategy.

Before joining CGS, Simon worked at Beaconsfield High School for five years in a number of capacities including Head of Science, ITTCo and ECF Professional Tutor and Acting Assistant Headteacher. Simon has previously held roles as Head of Chemistry and as KS5 Head of Year in schools in London and Madrid.

Simon grew up near Watford, before attending Bristol University to study Chemistry. He now lives in Chesham with his wife and two children.

Sarah Hammond - Finance and Operations Director

Sarah joined Chesham Grammar School in July 2021 as the Schools Finance and Operations Director, having worked in similar roles in a number of Buckinghamshire schools that faced very different financial challenges.  Sarah has extensive Local Government finance experience and previously was Director of Finance and Resources for two large local authority housing organisations.  She is a qualified accountant and has for a number of years been a governor in a local junior school.   Sarah is married with two daughters and spends her free time managing the Girls Rugby Section at Chesham Rugby Club.

Marion Rasekh - Associate Assistant Headteacher

Marion joined CGS in 2016. Prior to this, Marion worked in south east London, leading departments in Religious Studies, Politics, and PSHE Education, as well as serving in pastoral leadership. She also had the enriching experience of teaching in Japan for three years.

Marion currently serves as Year Leader and Subject Leader for LifeSkills, while also fulfilling her responsibilities as Associate Assistant Head, where she takes the lead on equality, diversity, inclusion (EDI) and wellbeing. Marion grew up in the Wirral and she studied Sociology and Religious Studies at Gloucestershire University. Today, she calls Pitstone home, where she resides with her husband and two children.