School Management Team

The Principal leads the School Management Team which oversees the whole school. Junior and Senior Schools each have their own Leadership Team led by the relevant Head of School.

Principal Gareth Warren

Name: Gareth Warren
Role: Principal
Profile: I read Pharmacology at Liverpool University before embarking on a PGCE at Bristol University specialising in Biology, Chemistry and General Science. A teaching career commenced that encompassed large comprehensive schools in England and Scotland, international education experience in Bermuda before entering the Independent Sector in Scotland. I progressed from Deputy Headteacher at George Watson’s College to become Principal at Morrison’s Academy, Crieff for 6 years, before being appointed as Principal of George Heriot’s School in 2020. I hold the Scottish Qualification for Headship and a Post Graduate Diploma in Educational Leadership and Management from Edinburgh University. Outside of school I enjoy relaxing through playing multiple sports, reading and spending time with my family.


Head of Senior School Paul Fairclough

Name: Paul Fairclough
Role: Head of Senior School
Profile: I read History and Politics at the University of York, before completing my PGCE and embarking on a 30+ year-long teaching career that has seen me take on departmental and senior leadership roles across a wide range of institutions: state to independent; single-sex to co-educational; and day school to boarding. A prolific and successful author in the field of UK and US government and politics, I have a particular interest in the fields of constitutional law, human rights, and judiciaries. Outside of school I enjoy listening to music and playing the guitar.




Head of Junior School Alastair Morrison

Name: Alastair G. Morrison
Role: Head of Junior School
Profile: As Head of Junior School, I have overall responsibility for the care and education of the children in Nursery to P7. Recruiting the most inspirational and diligent teachers ensures the children are in the best hands. Promoting the School to prospective pupils and parents gives me a lot of pleasure, for ours is an easy school to sell! After completing a PGCE at Durham, I cut my teaching teeth at The Edinburgh Academy, before joining Fettes as Deputy Head of the Prep School. My first Headship was of Feltonfleet School, in Surrey, before I returned to Edinburgh five years ago. I coach rugby and lead the school golf, a sport which is a passion for me in my ‘downtime’.




Deputy Head of Junior School Kirsteen O'Hagan

Name: Kirsten O’Hagan
Role: Deputy Head of Junior School
Profile: I began my career in Glasgow, teaching in a variety of state schools before working at Glasgow Academy. After moving to Heriot’s in 2000, I was promoted to Principal Teacher where I led staff professional development and our Learning Enhancement Department, introducing our very first philosophy lessons. My leadership extended to take on all three Depute positions before being appointed Deputy Head in 2012 with responsibility for Learning and Teaching, Curriculum Development and Pastoral Care. In addition to my role at Heriot’s, I am an Associate Assessor for Education Scotland and regularly join inspection teams evaluating both independent and state schools. My passion for learning, equality and diversity is reflected in my own studies as part of the Headship Qualification.




Director of IT Adrian Semmler

Name: Adrian Semmler
Role: Director of IT
Profile: I am responsible for directing the implementation, development, maintenance, security and support for the Information and Communications systems for the school and trust, which encompasses 3500+ pupils, staff, and parents. I have over 20 years’ experience in Information Technology, working in education and corporate sectors and am a founding member of the Scottish Independent Schools, ICT Managers’ forum. My industry certifications include Microsoft Certified Systems Engineer, Cisco Certified Network Associate and ITIL Certificate in IT Service Management. I teach part-time in the school’s Computing Science Department and have been involved in coaching rugby, cricket, and the school ski programme for a number of years.



Estates Manager Andrew MacLachlan

Name: Andrew MacLachlan
Role: Estates Manager
Profile: I arrived at Heriot’s in July 2010. Prior to that time, I served for 27 years in the British Army, generally working with the Royal Engineers although my final appointment before joining the school was as the estates and logistics officer for the UN Buffer Zone in Cyprus. My teams at Heriot’s look after the grounds, security, janitorial assistance, cleaning and disposal, purchasing and a myriad of maintenance requirements. Luckily, I have excellent teams because I am also responsible for managing the larger contracted projects that we undertake during the school holidays, and with an estate as old and as protected as ours this can be a complex problem. In my spare time I am the Section Commander of our school RAF Section, organising flying experiences, camps and competitions for the pupils, and I continue to serve as a Reserve Officer at 230 Transport Squadron in Edinburgh.


Name: Susan Donnelly
Role: Head of Human Resources
Profile: I began my career as a Primary School teacher, having completed a BEd (Hons) degree at Edinburgh University. After a couple of years in teaching I changed careers, moving into education recruitment and then Human Resources. Having gained considerable management experience in retail, travel education and financial services, I joined Heriot’s in 2011 and established the School’s HR department. I hold a Post Graduate Diploma in Human Resource Management from Napier University and am a Fellow of the Chartered Institute of Personnel and Development. Outside of school, I am married with two young daughters and enjoy cooking, music and escaping the city to the west coast as often as possible.




Director of External Relations Miranda Henderson

Name: Miranda Henderson
Role: Director of External Relations
Profile: I began my career in publishing for IDG Communications before moving into the creative industry in London, working for a Sales Promotion then an Advertising Agency where I installed ISO9001 and later became a Director. At the point of motherhood, I started a Design Agency which I ran for 20 years, working with cross-industry companies in the UK and overseas, building an independent schools specialism in the process as a parent, a supplier and a Governor and lecturing at IAPS and AMCIS conferences nationwide. I joined Heriot’s in June 2019 and am responsible for overseeing Admissions, Development, Marketing and the School Office, only made possible by having a fantastic and committed External Relations team of 14. I am a Chartered Marketer. Outside of school I like wild swimming, high altitude walking and flat coated retrievers.