Leadership team

Head Teacher
Mrs Helen Cullen

BSc (Hons)
Sports and Exercise Science with Human Biology

Helen was educated at Leweston School in Sherborne before studying a degree in Sports and Exercise Science with Human Biology. Helen completed her PGCE  at St Luke’s, Exeter University. With a teaching career based in the South West, Helen has worked in schools in both Devon and Somerset starting her career as a PE teacher before quickly progressing to middle leadership positions including Head of Year and Head of PE.

Helen has joined Sexey’s after having been Vice Principal at Preston School in Yeovil for the last 10 years. During this time she was the whole school lead for Pastoral matters including safeguarding, students wellbeing and support, student achievement and vulnerable students. Having been a SENDCo for 8 years Helen is passionate about inclusion and ensuring education is accessible for all students and that no student is disadvantaged by opportunity or resource.

Helen is delighted to be joining the staff at Sexey’s and leading the school and further developing the strong reputation that Sexey’s has for being a highly successful State Boarding school with strong GCSE and A level results.


Deputy Head - Curriculum
Mr Daniel Bull

BSc (Aberystwyth)

Mr Dan Bull was appointed Deputy Head – Teaching & Learning from April 2016, having previously been Associate Headteacher and Head of the Humanities Faculty at Sexey’s.

He organised Ten Tors and D of E expeditions, was an Officer with the school the Army Cadet Force (ACF) platoon and was part of the boarding staff community at Cliff House since he joined Sexey’s in 2001.


Assistant Head - Teaching and Learning
Mr Dan Glover

BSc (Loughborough)


Head of Boarding
Matt Kiely

BSc (Loughborough), BSA Diploma
Geography, Physical Education

Mr Kiely joins Sexey’s in 2018 having previously held roles as Head of Boarding at Walden School in Essex and Alexanders College in Suffolk, where he led boarding through a successful renaissance and inspection.

A graduate of both Loughborough and Durham Universities, Mr Kiely has also taught in South Africa and played representative rugby and basketball. He’s a keen Science Fiction reader and sports enthusiast.



Assistant Head - Pastoral
Mr Philip Clackson

BSc (OU)
Mathematics & Designated Safeguarding Lead

Mr Clackson joined Sexey’s in 2002 as Head of Mathematics. He also served as Housemaster of Walwin from 2003-2008 and was a Staff Governor from 2008 – 16.

Mr Clackson became Assistant Head – Pastoral in 2016 and is the lead for all aspects of the School’s Safeguarding. He is also father to four children who have all attended (or continue to attend) Sexey’s, making him well placed to understand the challenges and expectations of both secondary school students and their parents!


Business Manager
Mrs Helen Rogerson


Mrs Rogerson joined Sexey’s in 2008 and has steered the business side of the School with a firm hand ever since. A proud Northerner, she has a wicked sense of fun and is a keen walker, traveller and cook.