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 Foundation’s impact investment arm.  In this role, he leads the use of equity, debt, guarantees, and other investment tools to advance the Foundation’s philanthropic goals.  Thong brings more than 25…

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…

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,…

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…

Jessica joined the Gates Foundation in July 2025 as Senior Coordinator providing operational support to the Strategic Investment team. Prior to joining the Gates Foundation, Jessica built a career spanning more than 20 years in operations, human resources, executive support, and business administration within the biotechnology, pharmaceutical, and investment sectors. She spent over two decades…

Rutendo joined the Gates Foundation in 2026 and serves as Investment Officer for the Strategic Market Tools initiative within the Strategic Investment Fund (SIF). She partners with program strategy teams to structure, negotiate, and execute complex transactions with private sector entities, multilaterals, and governments, using guarantees and other structured/innovative finance tools to lower the cost…

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…

Elisabeth joined the Gates Foundation in March 2026 and serves as an Associate of the Strategic Investment Fund (SIF), where she works as a generalist across the Fund’s investment areas. Prior to joining the Foundation, Elisabeth was an Investment Banking Analyst at Morgan Stanley within the Industrials Group in New York City, where she executed…

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…

Logan Morwick Miller joined the Gates Foundation in 2023 and serves as an Associate of the Strategic Investment Fund (SIF). Since joining, Logan has evaluated and structured investments in the biotech, agriculture technology and education technology sectors, as well as volume guarantees supporting new HIV PrEP products. She is the Foundation’s Board Observer for Carnegie…

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.

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…

Sundar Kodiyalam is a seasoned investor and biotechnology executive with extensive experience across venture capital, biopharmaceutical strategy, and corporate development. He is a co-founder and served for more than a decade as Managing Director of Vatera Healthcare Partners, a family office-based venture capital firm, focused on investments in innovative life sciences and healthcare companies. Mr.…

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…

Dr Ann Taylor is an experienced clinical investigator and pharmaceutical executive with 20 years experience in the pharmaceutical industry, serving in multiple leadership roles at multiple companies.  She was Chief Medical Officer at AstraZeneca from 2019-2021 where she was responsible for employee and patient safety during the COVID epidemic, AstraZeneca’s Patient Safety, Quality Assurance, and…