Our Team

Paul Gunstensen

Director of WASH

Paul joined the Foundation as the Director of WASH in October 2015 and brings over 15 years’ experience in the global water and sanitation sector. Read more

Paul’s experience to date has bridged both rural and urban programming and his strength is connecting people, ideas and finance in a strategic way. Prior to this, Paul worked at Water & Sanitation for the Urban Poor (WSUP) where he played a key role in the development of the organisation over seven years, latterly as the Director for Partnerships & Development in charge of strategic partnerships and communications. A key part of this was a focus on the development of market-based solutions in WASH, with Paul playing a leading role in the development of WSUP’s work in this area. Paul started his career at WaterAid, where he spent over four years supporting their African, South Asian and Pacific programmes.

Sarah Hedley

Head of WASH Programmes

Sarah joined the Foundation as Head of Programmes in November 2015. Sarah previously spent six years at New Philanthropy Capital, a think tank and consultancy, advising charities and funders on their strategy and impact. Read more

Prior to that, Sarah worked for Intelligent Giving, a website that assessed the transparency and reporting of the top 500 UK charities.

Souraya Chenguelly

WASH Programme Manager

Souraya joined the Stone Family Foundation in June 2017 as WASH Programme Manager, after having spent four years at Water and Sanitation for the Urban Poor (WSUP) where she worked in finance and donor relationship management. Read more

Prior to this, Souraya spent three years at InterAide, a French NGO, supporting its rural WASH and health programmes in Malawi. Souraya has a background in economics and finance and started her career as a financial auditor.

Zoe Wilkinson

WASH Programme Manager

Zoe joined the Foundation in January 2019 as WASH Programme Manager, having spent the previous 10 years working in fundraising and corporate partnerships. Read more

Zoe has a keen interest in the role that business can play in tackling international development challenges, from social enterprises and small businesses to large corporations. Prior to joining the Foundation Zoe worked for Malaria No More UK, developing partnerships with companies in the fight to end malaria. She previously worked at Water and Sanitation for the Urban Poor (WSUP) in donor relationship management and partnership development.

Prior to this, Souraya spent three years at InterAide, a French NGO, supporting its rural WASH and health programmes in Malawi. Souraya has a background in economics and finance and started her career as a financial auditor.
Deleted: Zoe started her career as a corporate partnerships account manager, working primarily with large legal and financial firms to deliver their CSR activities.

Kathryn Pentecost

Enterprise Development Manager

Kathryn joined the Foundation as Enterprise Development Manager in November 2019. Kathryn previously spent five years working for Baringa Partners, a global management consultancy, which helps business run more efficiently, navigate industry shifts and reach new markets. Read more

During this time, she worked within retail and network businesses in the UK energy and water industry. Prior to this Kathryn delivered projects for social enterprises in the energy and WASH sector across Africa, Haiti and Cambodia, as a consultant for Whitten & Roy Partnership, a sales performance and management consultancy.

UK portfolios

The Foundation’s mental health and disadvantaged youth portfolios are managed by NPC. Read more

NPC is a charity think tank and consultancy that occupies a unique position between charities and funders, helping them achieve the greatest impact.

Charlotte Lamb

Senior Consultant, NPC

At NPC, Charlotte helps charities and funders evaluate, improve and communicate their impact. Read more

Before  joining NPC, Charlotte studied for an MSc in Cognitive and Decision Sciences at UCL, and worked for KPMG as a management consultant, where she worked in areas, including change management, culture change and organisation design across the private and public sectors.

Charlotte advises the Foundation on its Disadvantaged Youth portfolio. She helps the Foundation’s Board identify and assess organisations, and helps funded organisations with their reporting.

Matthew Mannix

Researcher, NPC

At NPC, Matthew supports charities and foundations to increase their impact.  Read more

Before joining NPC, Matthew worked at London Youth, where he helped organisations working with young Londoners to develop their theories of change and measure their impact, and at Citizens Advice, Kensington and Chelsea.

Matthew advises the Foundation on its Disadvantaged Youth and Mental Health portfolios. He supports the grant managers to identify new organisations to support and assists grantees with their reporting.