FIBR Advisors


Giselle Leung serves as a Director at the Global Impact Investing Network (GIIN), a not-for-profit organization dedicated to increasing the scale and effectiveness of impact investing. In this leadership role, she oversees development and ImpactBase (the GIIN’s searchable online database of impact investment vehicles), and manages relationships with key strategic partners. She was previously the founding manager of the GIIN Investors’ Council, a leadership group for active large-scale impact investors.

Prior to joining the GIIN, Giselle was Manager at Enterprise Solutions to Poverty (ESP), where she worked with leading companies in India, Colombia, Mexico and China to build inclusive business strategies that engage the poor in areas of agribusiness, microfinance and social enterprise. Giselle began her career at Cambridge Associates providing investment portfolio analysis to large non-profit endowments, and was a business strategy consultant at Braun Consulting. Giselle also served as a Peace Corps volunteer in Panama where she advised rural artisan groups on business operations, marketing and sales. Giselle holds an MBA and a Master of International Affairs from Columbia Business School and The School of International and Public Affairs, and a BA in psychology from Harvard University.



John Sheldon is SVP/group head of Innovation Management for MasterCard Labs. In this role, he is responsible for the programs and processes that help generate unique, innovative ideas, both internally and in collaboration with our key external partners.  His team supports the innovation process from ideation through prototyping and business case development, both developing new concepts and determining which opportunities make the most sense for MasterCard to pursue/incubate. Prior to joining MasterCard, Mr. Sheldon held various positions at eBay Enterprise, including head of growth programs and head of strategy.  At eBay, he led a team of e-commerce and digital marketing experts working closely with important retailers.  Previously, Mr. Sheldon held a number of consulting, marketing and strategy positions at Ogilvy, BBH, Oracle and Price Waterhouse at increasing levels of responsibility.  He was a founding partner at Customer Portfolios, a database marketing company in Boston, leading their strategy and analytic efforts. Mr. Sheldon graduated from the Wharton School at the University of Pennsylvania with a Bachelors of Science degree in Economics.



Marissa Drouillard is Senior Director at Caribou Digital. She is a researcher/consultant, avid globetrotter, and adventure sports enthusiast. After 11 years as a business and technology consultant, Marissa plunged into international development focusing on early-stage startups in Sub-Saharan Africa. She has advised mobile industry and international development organizations on digital entrepreneurship topics, including co-authoring several publications on entrepreneurship ecosystem development in emerging markets. Currently, she is developing a platform to channel funding and support to catalyze the growth of inclusive digital businesses and the next generation of technology leaders in Africa. Marissa has an MBA and a Certificate in Global Business from the Haas School of Business and a BSc from the College of Chemistry, all from the University of California at Berkeley, and an MSc in Public Policy with merit from the University of London, SOAS. She is Senior Director of Investment Advisory at Caribou Digital, a boutique consultancy working to build inclusive digital economies in emerging markets, and splits time between Cape Town, South Africa and Lake Tahoe, California.



Matthew Gamser is CEO of the SME Finance Forum, a center for knowledge exchange, good practice promotion and networking managed by IFC for the G-20 countries’ Global Partnership for Financial Inclusion.  He has over 35 years experience in private enterprise and financial sector development.  He has worked for IFC for 10 years in various positions, including heading the advisory services for the financial sector in East Asia-Pacific (from Hong Kong).  Prior to IFC he worked for 25 years in the private sector in management consulting and technology/small scale industry development.  He holds A.B. and A.M. degrees from Harvard University, and M.Sc. and D.Phil degrees from Sussex University (UK), where his work focused on the management of technological change.   



Nate Gonzalez is a Senior Product Manager at PayPal for cross-border P2P services and remittance products. Prior to joining PayPal, Nate was an Investment Officer with Accion Venture Lab, leading the team’s investment and portfolio management work in East Africa. He also worked at McKinsey & Company where he focused on the areas of payments, financial technology, consumer financial services, and financial inclusion. Nate received a bachelor’s degree from Vanderbilt University."



Priya Jaisinghani is the Director for the Center of Global Solutions within the US Global Development Lab for the U.S. Agency for International Development. In this role she leads the agency’s efforts to leverage digital technologies and data analysis systems to dramatically enhance the agency’s development outcomes. She oversees programs across Africa, Asia and Latin America that increase access to the internet, promote usage of digital financial services, and integrated data systems. She also oversees USAID’s internal data analysis center which serves USAID in improved, data-informed decision making using geospatial, social media and other data analytics tools. Prior to USAID, she served as Program Officer at the Bill and Melinda Gates Foundation, where she helped to launch a $1 billion Global Development Program.  Priya led the team responsible for the foundation’s strategy and entry into financial inclusion.  She also directed the team’s entrance into core new areas of grant making, including setting a strategy for expanding insurance for the poor.  Prior to her experience at the Bill and Melinda Gates Foundation, Priya served as Development Officer in the South Asia Program of the United Nations Foundation. She started her career at Enron as a Financial Analyst in new commodity markets. Priya received her Bachelor’s in Commerce from the University of Virginia and received her Master’s in International Relations from Johns Hopkins University’s School of Advanced International Studies (SAIS). 



Xavier Faz leads CGAP’s work on Digital Finance Frontiers, a global initiative that seeks to expand the application of financial technologies and digital delivery models to enhance financial solutions focused on the poor.  Mr. Faz’s work also includes exploring the link between financial inclusion and access to broader services. Mr. Faz manages CGAP’s work in Latin America.

Prior to CGAP, Mr. Faz was Director for Strategic Planning for a development bank in Mexico, where he developed a cloud based core banking platform focused on the Microfinance Sector, as well as a cards switch for non bank financial institutions.  Before, Mr. Faz was a consultant with McKinsey & Company where he worked with organizations in technology and business model innovation. He has a Master’s degree in Computer Science from Stanford University and an Engineering degree in Electronic Systems from the Instituto Tecnológico de Monterrey, México.




Mark Wensley is a Senior Program Manager at The MasterCard Foundation, where he leads the development of Financial Inclusion initiatives that expand access and deepen usage of digital financial services. He has worked in the financial inclusion space for 13 years, during which time he has focused on scaling technology-enabled and market-based solutions to meet the financial needs of low income households. Prior to joining the Foundation, Mark advised impact investors and donors on seed acceleration strategies to advance innovation in mobile financial services in Africa. Prior to that, he was the Global Selection Manager for Unitus, where he led the creation of new partnerships to provide catalytic investment capital and advisory to high-growth microfinance institutions. He has worked in South and South East Asia, Southern and East Africa and North America. Mark holds a Master’s of Economics of Development from the Australian National University, and a Bachelor of Commerce from McGill University, Canada.