Our Team

Thong Q. Le joined the Gates Foundation in December 2024 and serves as Investment Director and Managing Partner of the Strategic Investment Fund (SIF), the impact investment arm responsible for using equity, debt, and guarantee investment tools to further the philanthropic goals of the organization. Thong brings more than 25 years of investment experience in…

Natalie Revelle leads the Volume Guarantee initiative and structured financing investments within the SIF team. Working with pharmaceutical companies, sovereign and private foundation partners, donors, and implementing partners, Natalie has structured a portfolio of investments across global health commodities including vaccines, family planning, and HIV products that is expected to generate over $1 billion of…

David Rossow joined the foundation in 2010 as part of a $400 million pilot to establish the Strategic Investment Fund. He currently heads the fund’s international work with a focus on biotech in Europe, and tech-enabled service & product delivery in South Asia and Sub-Saharan Africa. Prior to joining the foundation in 2010, David worked…

Ryan Kreitzer joined the Strategic Investment Fund in 2014. Based in Seattle, Ryan invests across fintech, healthtech, agritech & climate, focusing on innovative companies that develop new solutions to long-standing challenges that impact patients, farmers and consumers globally. He also leads SIF’s investing practice in Sub-Saharan Africa, where he invests in businesses that deliver innovations…

Vanessa Bhark is a Principal at the Gates Foundation’s $2.5 billion Strategic Investment Fund (SIF), the foundation’s venture capital, debt, and guarantee fund. Prior to joining the Gates Foundation in 2021, Vanessa was a member of the investment team at Frazier Healthcare Partners, focused on biopharmaceuticals. Vanessa has also held positions in corporate and business…

Zainab Bakrin is an Associate at the Gates Foundation’s Strategic Investment Fund, focused on the Biotech Accelerator program. Prior to joining the Gates Foundation in 2024, Zainab was a member of the investment team at Casdin Capital, where she focused on life science tools, diagnostics, healthcare IT, and industrial applications of biotechnology. Zainab started her…

Kristin provides operational support to the Strategic Investment Team. She received a B.S. in hospitality and tourism management from Virginia Tech University focusing on event management. Starting as a contractor for the Gates Foundation five years ago, Kristin joined full-time soon after and has been with the SIF team for three years. Kristin focuses on…

While she maintains a diverse portfolio, Julie spends the majority of her time focused on healthcare delivery, which comprises debt, equity, and volume guarantee investments that improve primary healthcare, maternal and child health, and infectious disease. Recognizing that there will never be enough trained medical providers, she focuses on the role that technology-enabled diagnostics, devices,…

Antonio Garcia Maldonado is a Partner at SIF. He works on international investments with a focus on biotech in Europe and Israel, and tech-enabled service/product delivery in South Asia and Sub-Saharan Africa. Prior to joining the foundation, Antonio worked in the investment banking division at JPMorgan. There, he worked on structuring and executing M&A, equity…

Will joined the Gates Foundation in 2022, and works to evaluate, structure, and manage strategic investments across many different sectors to support the Foundation’s program strategies. His work to date has included guarantees supporting new tools to address malaria and to support childhood nutrition, as well as investments in financial services. Prior to joining the…

Logan joined the Gates Foundation in 2023, and works to evaluate, structure, and manage strategic investments across many different sectors to support the Foundation’s program strategies. Prior to joining the Foundation, Logan worked in the Private Capital division of Ontario Teachers’ Pension Plan, where she evaluated, executed, and monitored investments in the Diversified Industrials and…

Susan is a corporate attorney who advises on the foundation’s program-related investments, innovative finance investments and other complex transactions across the foundation. Prior to joining the foundation, Susan was counsel at the United States Development Finance Corporation (DFC) where she specialized in project finance investments in the renewable energy, healthcare, infrastructure and microfinance sectors in…

Ken is a corporate and securities attorney who provides strategic advice and practical solutions in connection with the foundation’s program-related investments and other complex transactions, as well as advising on securities compliance matters and general corporate governance.

Archana strives for the intersection of innovation & impact in South Asia. She joined the Gates Foundation in 2013 and established its venture investments presence in India in 2018, alongside maiden investments in South/South-East Asia. Based in London, her 17+ year career spans consulting, strategy, public policy, and impact investing across KPMG and Gates Foundation…

Jill manages the coordination of all strategic investments and contracts including data management and analysis. She acts as a primary point of contact for internal and external stakeholders ensuring deliverables and deadlines of portfolio investments are met. Prior to joining the foundation, Jill was an Administrative Assistant at Educational Services of America. Jill earned her…

Matt is a corporate and transactional attorney with over 25 years of experience negotiating and documenting complex investments. During his 11 years at the foundation he has been the lead transaction counsel on more than 50 completed program-related investments, mission-related investments and other innovative financing transactions involving entities in over a dozen different countries. Prior…

London Nimit Shah joined Vivo Energy as CFO in May 2024. Before joining Vivo Energy he was a partner in the investment team and Head of Debt Capital Markets at Africa-focused private equity firm, Helios Investment Partners. At Helios, he has led deals in more than 30 African markets, worth around $2bn of value. These…

Mumbai, India Sandeep is a Senior Advisor and Investment Committee Member at Avaana Capital, India’s leading early-stage climate action and sustainability fund. He is a Board Member of Titan Company Limited, chairs the Risk Management Committee and is a member of the Audit and Nomination & Remuneration Committees. He is on the board of HT…

Currently a consultant and senior advisor, Dr. Christopher B. Wilson formerly served as Director of Discovery & Translational Sciences at the Gates Foundation from 2010-2016. Prior to joining the Gates Foundation, he was a member of the faculty at the University of Washington from 1979-2009, where he served as head of the Division of Infectious…