Will is Sustainability Advisor to PricewaterhouseCoopers, and Chairman of Water and Sanitation for the Urban Poor (WSUP), a non-profit company bringing together private sector and NGO member organisations to pursue the Millennium Development goal for water and sanitation in the poorest parts of the world.He is a member of the Council of Ambassadors of WWF (UK), the Advisory Board of the ICAEW, and the CR Panel of British Land. Until March 2011, he was Chairman of the Sustainable Development Commission, the UK government’s independent advisory body. He has been Chairman of the BBC Children in Need Appeal, the largest grant giver for disadvantaged children in the UK, and was an independent assessor for the public appointments process of the Department of Culture, Media and Sport (DCMS). He was a Special Advisor to the United Nations Development Programme (UNDP) between 2004 and 2009, and UK Commissioner on the Ramphal Commission on Migration and Development in 2010/11. Until October 2012, he was Trustee, and interim Chairman, of the Overseas Development Institute (ODI).
He spent twenty years working with a range of relief and development NGOs (Save the Children, OXFAM, Opportunity Trust) in Uganda, Kenya, Ethiopia and Sudan, and most recently was Chief Executive of CARE International UK. He was involved in the establishment of Comic Relief, a fundraising and grant-making organisation, and as its first Grants Director was responsible for setting up its grants programme for Africa.