Meet our leadership team

From 1st April 2020, Yarrow has joined the Certitude group. Find out more about the leadership team here.

Aisling Duffy – Chief Executive


Aisling has spent her career to date working within not-for-profit organisations, seeking to improve opportunities for people with learning disabilities and people with mental health support needs. Aisling is delighted to work with external and internal partners to ensure these ambitions are realised for people we support and the communities with whom we work. Aisling is Vice Chair of the Voluntary Organisations Disability Group (VODG) Board, a member of the NDTi Board and a member of the Guardian Public Leaders Board 2017.

Raj Mungur – Director, Care and Support

Raj joined Yarrow in 2002 to head the care and support team and in 2015 he was promoted to Director of Care and Support. Raj has worked in both the NHS and the voluntary sector having started his career as a qualified nurse for people with learning disabilities with a keen interest in resettlement work. In the early 80’s Raj took the lead role in moving a group of young people from an institutional setting into an ordinary house in the community and was later part of a larger resettlement project which involved moving 55 people out of a long stay hospital into ordinary living in Guildford. Raj has developed, established and managed community-based services for people with a range of support needs including complex needs. Since the closure of hospitals, he has seen many shifts in approaches from normalisation, social role valorisation to person-centred support and now personalisation, and throughout these changes his guiding principle has been to see people take their rightful place in society and not be marginalised.

Darren Kirby – ISF Development Manager

Darren joined Yarrow in 2000 initially managing a residential service before becoming a service Manager in 2004. Darren has over 30 years’ experience of working for charitable or not for profit organisations including homelessness and physical disabilities and an extensive background working with people with a learning disability and complex behaviours. Darren is an accredited safeguarding trainer for the organisation as well as leading Yarrow’s behaviour support team in supporting our services to manage people with complex behaviours. Darren’s recent work has been to develop services under an Individual Service Fund, transferring them from an existing block contract into personal budgets allowing people the greater opportunity to choose the services they want.

Joan Sterling – Service Manager

Joan has more than 25 years’ experience working within Yarrow, since joining as a Registered Care manager in 1993. Her role here was focused on bringing people back into their communities following the closure of long stay institutions such as Leavesden and Cell Barnes. Joan was instrumental in developing an accessible sexuality policy in 2002, developed the first accessible business plan for Yarrow in 2003, and has been leading the Supported Living Managers’ Group since 2005. Since 2007 she has been Yarrow’s Registered Domiciliary manager, which currently supports 74 people, and was awarded an Outstanding rating by the Care Quality Commission in 2019.

Sonia Simon – Service Manager

Sonia has worked with people with learning disabilities since 1986. She joined Yarrow in 1993 working to bring people back into their communities from long stay hospitals. Sonia is passionate about supporting people to develop, flourish and fulfil their aspirations. She has been the lead on a number of projects including deregistering the first set of registered care services to become supported living services. She was also the facilitator of Yarrow’s Have Your Say group and has recently worked with the Open University on a project to give women with learning disabilities better support using contraception. Sonia is a member of the Beyond Autism Committee Advisory Board. Her current role includes overseeing and developing support for people with a range of needs.

Martyne O’Reilly – Service Manager

Martyne joined Yarrow in 1996. She has a Learning Disability Nursing qualification and extensive practical experience of working in the health and social care sector. She is also an accredited medication and manual handling trainer for the Yarrow, and set up the organisation’s Acquired Brain Injury service. She mentors and assesses student learning disabilities nurses during placements within Yarrow. She has also recently devised a medication auditing tool for Yarrow to ensure that systems and practices are safe and in line with legislation and CQC requirements. Martyne is passionate about reducing over medication and supporting people with learning disabilities to live their own lives, ensuring that the support they receive is of the highest quality.

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