Qualified in Applied Psychology and Commerce, she has worked as a financial analyst as well as in private equity and venture capital investment banking in South Africa and internationally for more than twenty years.  She established GreaterCapital in 1998.  In 1999, she started The Funding Site as a web-enabled resource site and in 2004 founded the internationally acclaimed award-winning social networking platform, GreaterGood South Africa, a social profit organisation dedicated to utilising 21st Century technology to facilitate indigenous philanthropy and performance-based giving and social impact investing in South Africa. Through GreaterGood Tamzin conceptualised and developed the South African Social Investment Exchange in June 2006.  SASIX has facilitated significant capital allocation to both performance-based philanthropy and impact investment whilst also leveraging larger-scale external investment in social financial offerings.  For the past two years, Tamzin has focused on establishing Nexii to promote coherence and organisation for maximum efficiencies in the impact investing sector. She has continually sought to use the markets for greater social good and was awarded the GIBS Social Entrepreneur of the Year Award in 2007 and appointed an Ashoka fellow in 2008.

Carol has spent significant effort on the development and implementation of replicable tools and initiatives that work towards the establishment of sustainability in Africa and played an important role within the cross section of civil society, private and public sector, building the field of philanthropy, grant making and increasingly, social investment while facilitating new forms of collaborative funding for development work.  Carol led CSR Systems, GreaterGood’s social enterprise focused on developing online platforms, business process technology and tools for the impact capital markets over the past two years. She is a member of the GRI Social Sector Supplement working group and was a participant in the Skoll Foundation’s Global Social Benefit Incubator in 2007.

She has significant experience in Kenya with strategic management and business development for community based organizations in urban informal settlements. Previously working for Smith Barney Morgan Stanley, Justine structured securities models to track earnings growth, profitability, and valuations of equity positions for high net worth clients. She created a long-term integrated communications strategy for a local boutique investment advisory to reach new client pools in Lake Oswego, Oregon.

Justine has also coordinated the recruitment, curriculum development and delivery of a summer school program for East African youth refugees under UN mandate in Portland, Oregon to ensure they pass benchmark exams. She has a B.S. dual-degree from American University in Business Administration and International Studies and was selected into the Early Identification Program, and she is also part of the Phi Beta Kappa and Beta Gamma Sigma honor societies.

She was a founding investor in Switch & Data Facilities, which was acquired by Equinix in 2010 for $800+ million. She helped sell a company to AIG, Inc. in which she had been a Partner, an Executive Vice President and the Chief Financial Officer. Sari founded a publicly traded insurance company that grew to hold assets in excess of $1 billion. She served on its Board of Directors and chaired the Executive and Investment Committees. Sari received a B.A. from Barnard College, Columbia University and an M.B.A. from the Wharton School, University of Pennsylvania. She lives in New York City.