Management Team

David McGuire
Chief Executive

While studying for a teaching degree at the University of Córdoba, at the age of 18 David set up his own company which was dedicated to the provision of health and safety services to different communities.

David joined Diagrama on leaving university and spent his first five years as a Social Educator in a secure establishment for the Diagrama Foundation in Spain, also achieving his Social Educator Degree during that time. In 2006 he lead an after-care programme which helped over 400 children and young people who had been through the justice system.  He established links with all the relevant community agencies and organisations which support the young people to reintegrate into society.

In 2008 he moved from Spain to the UK with his family to establish the Foundation in the UK and was appointed Chief Executive in 2009.

David is member of the European Society of Criminology (ESC) and the European Prison Education Association (EPEA).

Nathan Ward
Head of Children's Services

Nathan’s early career saw him involved in a variety of youth and community work through the church, local primary schools and local authority youth clubs, whilst also providing consultancy services to other youth organisations on both a local and national level. He became licensed by the Bishop of Rochester as a Youth Minister as well as joining the Diocesan Synod as a nominated member. He has since been ordained as a priest.

He started working as a chaplain at a secure training centre in 2001, where he was responsible for managing the spiritual development and pastoral care for all the young people coming into the centre. Nathan’s role developed to encompass the strategic development and oversight of the Duke of Edinburgh Award, the “Every Child Matters” agenda, health and safety, security, staff training and development.

In 2012 he became head of children’s services at an immigration removal centre where he oversaw enrichment activities for any children temporarily placed at the centre prior to repatriation. He was later appointed as overall head of the 156-bed centre.

Nathan joined Diagrama in 2014, and now has responsibility for Diagrama's children’s homes and our fostering and adoption services.

Derek Milliken
Head of Healthcare Services

Derek brings to Diagrama over 26 years’ experience in a variety of sectors, the most recent of which have been as a senior executive in a FTSE 100 global organisation.

His main career focus has been in the custodial sector, where he project managed the operational mobilisation of a large new build custodial centre, going on to successfully run this and an adjoining establishment. During that time he was able to negotiate a contract extension which delivered improved margins for the business whilst delivering significant savings for the customer. He was also instrumental in delivering staff efficiencies through improved retention rates and strong absence management procedures.

Derek has overseen the robust statutory inspection requirements which are set by various regulatory bodies such as Her Majesty’s Inspectorate of Prisons, Ofsted and the Care Quality Commission and was proud to share with his team the achievement of external accreditation from Investors in People and the British Safety Council 5 Star Award, International Award, Sword of Honour.

As a contract director, Derek oversaw the delivery of 24 hour Primary Healthcare Services including GP clinics, nurse clinics and emergency response, mental health, dentistry, optician and various other health and well-being related services.

Derek has significant experience of building and maintaining customer and stakeholder relationships, in particular with public sector clients, and also brings extensive insight, knowledge and experience of cultural, social and health issues and challenges in complex environments.

Brian De Lord
Head of Education

Brian De Lord has undertaken a number of diverse roles in the education and social care fields. He has worked in the public and voluntary sectors ranging from practitioner to academic. Having founded Pupil Parent Partnership in 1994 as a response to the Southall riots, Brian led the organisation from one practitioner supporting 15 young people to an Ofsted registered independent school with three sites in West London and 150 pupils.

Alongside the above, Brian built up an extensive portfolio of research and advocacy projects funded and published by the European Commission, which have led to a more direct focus on transferring these local services throughout Europe.

He then set up a charity called Europeace Youth in an attempt to harmonise his previous experiences into an innovative, new delivery structure to support vulnerable children, their families and communities, underpinned by a systemic-based methodology and a practice that interfaces with statutory services in order to increase the effectiveness and sustainability of their interventions.

Europeace Youth is now part of Diagrama Foundation, and Brian is responsible for developing our alternative education services for vulnerable and troubled children and their families.

Stephen Taylor
Head of United Safe Care Limited (USC)

Stephen’s early career began in HM Forces in a variety of roles, serving in differing theatres around the world and he was also a senior Class 1 Combat Medical Technician.  Upon leaving the Army, Stephen joined Kent Police where he spent some years as a uniformed patrol officer before moving into criminal investigation, before joining the major crime unit. He then left Kent Police to set up his own investigation and security business, and oversee security operations for the UK Government in China.

Stephen was responsible for supplying both Government departments and main contractors with Home Office accredited detention escort and custody officers, prison custody officers and Youth Justice Board escorting officers, as well as industry security, including to the largest UK ports. His medical escorting services supplied a full range of medical services to clients including the Immigration Service and the UK courts. Stephen holds all of the required clearances, qualifications and accreditations in these fields and often assists his teams in the operational performance of these tasks. He is currently in the latter stages of taking his Masters Degree in Global Management. Stephen, and his company, became part of the Diagrama Foundation in July 2015.

Mary Collier
Head of Legal

Mary has spent the past 10 years in private practise, and is currently a partner in a central London firm where her work extends over a broad range of commercial matters including residential and commercial property, company and intellectual property.

Over recent years she has expanded her firm's charity practise, driven mainly by her interest in community and social welfare. It was therefore a natural step when in 2015 she took on the role of in-house counsel for Diagrama Foundation.

At Diagrama Mary looks after all the legal and business affairs needs for the charity and its subsidiary trading companies, as well as governance and compliance. She splits her time between Diagrama in Rochester and her firm's offices in central London.

Richard Dunn
Head of HR

Richard is a highly innovative commercially aware HR professional who has a wealth of experience within all aspects of people management at strategic and operational levels spanning a career of 40 years in the public and latterly private sector.

His experience covers all major sectors within a custodial environment, including prisons, police services, immigration and children’s services.

His recent achievements include supporting the operational mobilisation of a large new build custodial centre involving significant recruitment and training and employee engagement initiatives; leading the HR aspects of a variety of acquisitions involving TUPE and supporting the operations in achieving QA and Investors in People external accreditation.

Richard has significant experience of implementing change within organisations and supports the operations in driving through people management issues ensuring best practice is championed within the organisation.

Julie Firth
Marketing and Communications manager

Julie is an award-winning, multi-skilled communications professional. She has previously worked as marketing design manager for Express Newspapers and later as a senior multimedia journalist at the Press Association.

Prior to joining Diagrama in 2015 she was responsible for all PR, marketing and communications for a thriving children’s cancer charity.

Julie has extensive experience of publication editing and design, social media management, web content management, internal and external communications, campaigns, publicity, press relations and marketing. She is responsible for the development and implementation of the marketing and communications strategy for the Diagrama Foundation across all areas of its work - encompassing internal communications, management of social channels and all PR activity.