
A Lifetime of Impact
$1,236,139,696
given to date
Giving Matters: A Message From The Team
As the small team entrusted with carrying out the daily operations of the Dave & Cheryl Duffield Foundation, we are consistently reminded of the privilege it is to support Dave and Cheryl’s philanthropic vision.
Their commitment to the causes they support goes beyond financial giving; it is rooted in a desire to make a meaningful impact for pets, people, and communities across the United States. They've turned animal shelters into innovative spaces of healing and hope. They've built an elite Service Dog breeding and training center. They've provided resources for schools to become world-class environments for learning and development. And they've strengthened various public service institutions to better serve their communities.
Driven by their love for their family dogs and birds, Dave and Cheryl’s dedication to animal welfare stems from a promise they made to their first four-legged family member, a Miniature Schnauzer named Maddie: If they ever had the resources, they would give back to Maddie’s kind so other families could experience the same joy they had with her. That promise came true when they founded Maddie’s Fund in 1994. Today, Maddie’s Fund is a national voice in the well-being of shelter animals.
Their support of U.S. veterans stems from a deep love for their country and a profound gratitude for those who serve. Dave and Cheryl both have family members who have served in the military, further strengthening this personal connection.
Their public service projects are often a way of expressing appreciation for the role these institutions play in strengthening communities.
The level of consideration that Dave and Cheryl give to causes they personally care about sets the tone for the Foundation and influences how we approach our work every day. Working on behalf of a foundation that reflects their name and values is a responsibility we hold with deep respect. It is an honor to contribute to efforts shaped by their thoughtful, intentional, and relational approach to philanthropy.
Impact

More than $520 million in contributions from Dave Duffield (’62, MBA ’64) – including a 2026 pledge of $371.5 million and a 2025 commitment of $100 million – has established the Cornell David A. Duffield College of Engineering. His newest pledge is the largest single gift in Cornell history.
Dave's cumulative giving across Cornell’s colleges now totals $550 million, placing him among the university’s all-time leading donors.
Cornell University's Duffield Hall is one of the country’s most sophisticated research and teaching facilities for nanoscale science and engineering. It supports research and instruction in advanced materials processing and electronic, photonic, microelectromechanical, and biotechnology devices. This facility was designed to facilitate innovative work in a welcoming and generative environment for faculty and students to interact.
(Source: Duffield Hall Space and Reservation System)

A flagship initiative of the Duffield Foundation, Liberty Dogs is a national Service Dog training and placement program for U.S. military Veterans diagnosed with post-traumatic stress disorder (PTSD). Based in Reno, Nevada, Liberty Dogs offers hope and dignity for Veterans seeking support for their healing and recovery.
On campus, Veterans spend two weeks learning, living, and training with their Liberty Service Dog. They leave with their new companions, prepared to lead more independent lives with the company and support of a Service Dog trained for their specific needs. All services are provided at no cost to program participants.
Dave and Cheryl founded Maddie's Fund® in 1994 to honor their feisty Miniature Schnauzer Maddie. While playing with her one evening, they made her this promise: If they ever had any money, they would use it to help companion animals, so others could experience the same joy they had with Maddie.
The Duffields made good on their promise, and now 32 years later, Maddie's Fund has become a national voice in the animal well-being community, awarding over $300 million in grants for innovative solutions, education programs, and collaborations.

Other Changemaking Partners
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Army and Navy Academy
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Bissell Pet Foundation
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Boys & Girls Club of North Lake Tahoe
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Cornell University Duffield Institute for Animal Behavior
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Cornell University Promise Scholarship
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Ho-Ho-Kus Public School
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Incline Tahoe Foundation
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Incline Village Community Hospital
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K9s for Warriors
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Lake Tahoe School
- Maui Humane Society
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Monte Vista High School Student Center
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Open Door Collective
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Pet Network Humane Society
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Ridgewood High School
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Washoe County School District's Incline High School
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Washoe County Sheriff's Office
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Yes to Care


