William J. and Dorothy K. O'Neill Foundation is a foundation based in Cleveland, United States. Verified contact details, AUM data, and investment preferences on FindLPs.
We strive to improve the health and well-being of the families in the communities we call home. We support organizations that address behavioral health, addiction, primary and preventative health, healthy lifestyles, and special needs populations.
Investment types: Philanthropy
Sectors & themes: Charitable Investments, Grants & Scholarships, Impact Investing, Healthcare Services, Fund Raising, Education, Community & Social Welfare, Civic & Public Affairs High-Level Sectors, Non-Profit, Values-Based Investing, Healthcare & Life Sciences, Healthcare
Preferred geographies: United States, Canada
Location: 7575 Northcliff Ave.\nSuite 205\nCleveland\nOhio\n44144\nUnited States
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LP firm data compiled from public regulatory filings (SEC Form ADV, FCA, AIFMD disclosures), company websites and press releases, LinkedIn public profiles, and verified outbound email testing. AUM figures reflect self-reported values from filings and may lag by 1–2 fiscal quarters; bands are normalized in USD. We do not publish personal residential information; firms or individuals may request removal at /contact. Methodology & sources · Updated July 2026.