Our Team

Paul Gunstensen

Director of WASH

Paul joined the Foundation as the Director of WASH in October 2015 and brings over 10 years’ experience in the global water and sanitation sector. 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 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 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. Prior to that, Sarah worked for Intelligent Giving, a website that assessed the transparency and reporting of the top 500 UK charities.

Souraya Chenguelly

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.

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.

UK portfolios

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

NPC is a charity think tank and consultancy that occupies a unique position between charities and funders, helping them achieve the greatest impact. It has extensive experience of working with clients and undertaking research in both the mental health and youth sectors.

Find out more about the team below.

Charlotte Lamb

Senior Consultant, NPC

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.

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

Carin Eisenstein

Consultant, NPC

Carin advises the Foundation on its Mental Health portfolio, preparing grant recommendations and assisting grantees in their reporting.

At NPC, Carin works with charities and funders on developing theories of change, designing and implementing measurement tools and practices, and conducting sector research. Prior to this, Carin worked at the Anna Freud National Centre for Children and Families, where she supported child and adolescent mental health services with their routine outcome measurement, and as a strategy consultant at Deloitte.

Matthew Mannix

Researcher, NPC

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.

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