# Toyin Ajayi

> Toyin Ajayi is a board-certified family medicine physician and the co-founder and CEO of Cityblock Health, a New York-based company that builds neighborhood-rooted care for Medicaid and dually eligible patients - the people most health systems treat last. She co-founded the company out of Google's Sidewalk Labs in 2017, took the CEO seat in 2022, and has grown it into a roughly $6 billion business serving hundreds of thousands of members. Trained at Stanford, Cambridge, and King's College London, she practiced in safety-net hospitals and ran a clinic in Sierra Leone before deciding the system itself needed rebuilding. Her current obsession: making the most vulnerable patients the proving ground for AI in medicine.

- **Role:** Co-founder and CEO at Cityblock Health
- **Organizations:** Cityblock Health, Commonwealth Care Alliance, Foodsmart (board), National Academy of Medicine
- **From:** Boston, United States
- **Nationality:** American (Nigerian heritage; raised in Nairobi, Kenya)
- **Education:** BS, Human Biology, Stanford University, MPhil, University of Cambridge, MD, King's College London School of Medicine, Residency, Family Medicine, Boston Medical Center
- **Known for:** Co-founded and grew Cityblock Health to a roughly $6 billion valuation, Elected member of the National Academy of Medicine (2024), TIME100 Next (2023)

## Career timeline

- **2009** — Founded a non-profit improving healthcare in Freetown, Sierra Leone
- **pre-2017** — Chief Medical Officer of Commonwealth Care Alliance, serving 20,000+ dually eligible beneficiaries in Massachusetts
- **2017** — Co-founded Cityblock Health out of Sidewalk Labs with Iyah Romm; served as President and Chief Health Officer
- **2022** — Appointed CEO of Cityblock Health when Iyah Romm stepped down
- **2023** — Named to TIME100 Next, Modern Healthcare Women to Watch, BBVA Founding 50
- **2024** — Elected member of the National Academy of Medicine; Georgetown School of Health commencement speaker
- **2025** — CNBC Changemaker, Fierce Healthcare Women of Influence, Inc. Female Founders 500
- **2026** — Published 'Medicaid + AI: A New Standard for Innovation'; joined Foodsmart board of directors

## Achievements

- Co-founded and grew Cityblock Health to a roughly $6 billion valuation
- Elected member of the National Academy of Medicine (2024)
- TIME100 Next (2023)
- CNBC Changemaker (2025)
- Modern Healthcare Most Influential Clinical Executives (2025) and Women to Watch (2023)
- Entrepreneur Magazine 100 Women of Impact (2021)
- Aspen Institute Henry Crown Fellow

## Latest updates

- **2026-03** — Joined Foodsmart's board of directors and published 'Medicaid + AI: A New Standard for Innovation'
- **2025-11** — Told CNBC the broken U.S. health system is an opportunity, with public engagement on affordability rising
- **2025-02** — Named a 2025 CNBC Changemaker

## Links

- Website: https://cityblock.com
- LinkedIn: https://www.linkedin.com/in/toyin-ajayi
- Twitter/X: https://twitter.com/cityblockhealth
- Facebook: https://facebook.com/CityblockHealth

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Profile page: https://yespress.io/toyin-ajayi
Published by YesPress — https://yespress.io
Last updated: 2026-06-04