About Stephen Siller Tunnel to Towers Foundation
To honor the legacy of Stephen Siller by supporting first responders, veterans, Gold Star families and others affected by service-related loss or injury through building smart/accessible homes, providing housing and case management for homeless veterans, disaster relief, and 9/11 educational initiatives.
Focus Areas
VeteransFirst respondersHousing and homelessnessDisaster reliefEducation and remembrance (9/11 curriculum)Family support (Gold Star families)
Who They Fund
veterans and service membersUkrainian civilians and/or military beneficiariesburn injury patientsfirst responders / local fire departmentslocal community organizations in Phoenix and Riverside
About Stephen Siller Tunnel to Towers Foundation
The Stephen Siller Tunnel to Towers Foundation’s largest recent grant is a $72 million multi-year award to United States Veterans Initiative in Los Angeles. That scale fits a grantmaker built around housing and service-linked support: the foundation funds mortgage-free homes for fallen first responder families, specially adapted smart homes for catastrophically injured veterans and first responders, and housing and case management for veterans experiencing homelessness. It also backs remembrance and education work tied to 9/11, along with relief for families affected by military loss and injury. A recurring theme in the recent grants is direct support for organizations that deliver housing or specialized services rather than short-term program-only awards. United States Veterans Initiative appears repeatedly across 2023 and 2024 with separate awards for Phoenix, Riverside, apartments, and comfort homes, showing a sustained relationship with one major housing provider. The foundation also supports veteran-serving groups such as Veterans Matter, including a $3.1 million grant in 2025, and Semper Fi & America’s Fund, which received $6 million in 2025 after a $5 million grant in 2024. Recent grants also reach memorial, scholarship, and disaster-relief work.
What Stephen Siller Tunnel to Towers Foundation Funds
Housing is central to the foundation’s grantmaking. It awarded $294,797 to United States Veterans Initiative for comfort homes and $159,171 to the same organization for apartments, both in Los Angeles, reflecting a housing-oriented relationship with the same provider. The Homeless Veteran Program and the Smart Home Program align with that pattern of direct housing support for veterans and first responders. Education and remembrance are another clear theme. The foundation gave $250,000 to the Global War on Terrorism Memorial Fund in Washington, DC for the GWOT Memorial, and $198,000 to The Thomas R. Elsasser Memorial School, supporting commemorative and educational work. It also funds scholarship-related initiatives through the Tunnel to Towers 9/11 Institute and the Footsteps To The Future endowment. The foundation also makes grants tied to Ukraine support and military family assistance, including $1.2 million to Kids Save in Los Angeles for Ukraine support and $148,500 to Ufa Widows & Childrens Fund in New York.
How Stephen Siller Tunnel to Towers Foundation Gives
Financial Snapshot
Annual Giving
$16.4M
Total Assets
$652.8M
Total Revenue
$559.4M
Total Expenses
$381.1M
Typical Grant Size
Most grants fall between $20K and $213K, with a median of $50K.
25th Percentile
$20K
Median
$50K
75th Percentile
$213K
Geographic Reach
National21 states funded
Funding intensity
LowHigh
Headquarters
Leadership
MARY SCULLIN
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