Steven Van Yoder is the author of Get Slightly Famous: Become a Celebrity in Your Field and Attract More Business With Less Effort. His firm Get The Word Out Communications helps global companies become recognized authorities in their industries and reach their best clients and customers.

Steven-Hristo Evestus is a former Estonian state prosecutor and a member of the NGO Transparency International Estonia.

Stewart McCulloch is the global insurance director of VisionFund, the microfinance division of World Vision the child-centric relief, development and advocacy INGO. He is responsible for the provision of insurance products to VisionFund's 1 million clients and the development of financial safety nets to help these clients deal with climate and other similar shocks. Prior to joining VisionFund, Stewart had a 30-year career in international insurance including leading an international insurance broker as CEO.

Stoyan Tenev is a senior manager for evaluation at the World Bank Group. His area of responsibilities includes the evaluation of financial and private sector development operations of the World Bank Group. Previously, he was the lead economist for the East Asia and Pacific region of the International Finance Corporation.

In 2003, Stuart Reid co-founded The Partnering Initiative, an independent nonprofit organization providing research, training and consultancy around international cross-sector partnerships. Stuart now sits on the TPI board of trustees as well as continuing to contribute significantly to a range of TPI’s programs. One of Stuart’s most striking assets is his ability to bridge the gap between research and practice — combining academic rigor with highly pragmatic and implementable approaches. He has extensive experience of partnership evaluation and organizational change and development from his many years of consultancy and research.

Sue Cavill is a consultant with over 20 years of global experience in WASH, including strategy development, policy-relevant research and analysis, monitoring and evaluation, technical support to program design, and capacity strengthening. She is a specialist in gender equality and social inclusion, applying this knowledge to projects implemented by a range of clients, including NGOs, bilaterals, and multilaterals.

Sue Coates is the executive director ad interim of the Water Supply and Sanitation Collaborative Council, which is hosted by the United Nations Office for Project Services in Geneva and advocates for improved sanitation and hygiene for the most vulnerable and marginalized people around the world. Coates joined WSSCC in July 2018. Previously, she was the regional WASH adviser for UNICEF Eastern and Southern Africa in Nairobi and chief of WASH in UNICEF India, among other positions.

Suela Aksoy is a philanthropy professional with over eight years’ experience in global and local grant giving, focusing on education, risk and resilience, and mental health causes. She has successfully managed both corporate social responsibility initiatives and research projects. In her current role at Lloyd’s Register Foundation, Suela manages the delivery of the World Risk Poll and leads the associated funding call process.

Sufian Ahmed was Ethiopia's finance minister for two decades and served as an economic adviser to the country's prime minister from 2015 to 2017. He is a member of the G-20's Eminent Persons Group on Global Financial Governance, as well as the advisory board for the Harvard Ministerial Leadership Program. He is also a nonresident fellow at the Center for Global Development and a board member for the Centre for Disaster Protection. Sufian holds a master’s degree in Economic Development and Planning from Addis Ababa University.

Sujay Santra is the founder and CEO of iKure. With over 12 years of experience in the IT sector, Sujay started iKure with the vision to provide quality healthcare which is affordable and accessible, up to the last mile. In recognition to his outstanding efforts in the field of social innovation, he was awarded the Ashoka Fellowship in 2016.