California · Nonprofit
THE RADIOSURGERY SOCIETY
THE RADIOSURGERY SOCIETY (California) receives grants from 1 organization whose IRS filings report $65,000 to it, the largest being Silicon Valley Community Foundation ($65,000). 1 of them have funded it in more than one year, and 100% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- Revenue FY2025
- $1.2M
- Funders on record
- 1
- Grants received
- $65k
- Net assets
- $2.0M
What The Radiosurgery Society does
Mission
The Radiosurgery Society is a multi-disciplinary non-profit organization, consisting of surgeons, radiation oncologists, physicists, and allied health professionals, who are dedicated to advancing the science and clinical practice of SRS, SBRT and advancing therapies. ..
As stated on its FY2025 Form 990.
Programs
EDUCATIONAL RESOURCES - 1. Webinar Series. Ongoing series of educational web-conferences. Sessions are provided live to all and via recording to RSS members. Continuing Medical Education Credits (CE) are awarded to physicians, nurses and medical physicists who attend the live session. 2 Dosimetry Plan Library. An online tool to educate physicians, medical physicists and dosimetrists on SRS/SBRT treatment planning techniques. Example cases are available to members for download to practice SRS/SBRT treatment planning techniques and compare with reference plans created by an expert panel. 3. Resident Program. Residents and faculty advisors meet monthly to develop educational and professional development programs including webinars, workshops, mentorship & career pathways program and research projects to the professional development of residents, students and trainees in the field of SRS, SBRT and advancing therapies. 4. Distinction in Stereotactic Radiotherapy accreditation program. The Distinction in Stereotactic Radiotherapy program focuses on practice standards, patient management and medical physics aspects unique to SRS/SBRT treatment. The program was designed by professional…
$182,595 spent$547,993 earned by the program22% of program spendingRESEARCH PROGRAMS - 1. RSSearch Patient Registry Publications. Online, multi-platform database dedicated to the collection of screening, treatment and follow-up data from patients treated with SRS, SBRT and advancing therapies. 2. RSS Online Journal . The RSS manages the content of a channel within the Cureus Journal of Medical Science (www.cureus.com). We coordinate the peer-review submission process, solicit manuscripts for publication and publish accepted abstracts from the RSS Scientific Meetings. The RSS also works with the Journal of Neuro-Oncology. 3. GRID, LATTICE, FLASH and Microbeam Working Group. RSS members and experts in GRID, LATTICE, FLASH and Microbeam meet monthly to address the clinical and scientific facets of these therapies with a goal of conducting research to advance clinical treatments for patients. 4. Functional Radiosurgery Working Group. RSS members, physicians, medical physicists and health care providers specializing in functional radiosurgery meet monthly to develop educational and training programs to advance clinical treatments for patients with functional diseases. 5. Website. Host information about and provide access to all RSS programs, resources…
$111,966 spent$92,626 earned by the program14% of program spendingRSS SCIENTIFIC MEETINGS AND WORKSHOPS - Advances in applications, technologies and methodologies of SRS, SBRT and advancing therapies continue to evolve rapidly, creating a need for continual learning. The RSS hosts national and international meetings to disseminate new scientific findings and technical innovations and expand basic knowledge relevant to clinical practice and improve patient outcomes. The educational elements are targeted to radiation oncologists, neurosurgeons, oncologists of all disciplines, medical physicists, nurses, therapists, residents, students and other professionals involved in radiotherapy. Attendees receive state-of-the-art practice information relating to radiation and oncology. The RSS hosted the workshop "Navigating the Emergence of Radioligand Therapy" on November 21, 2024 at Albert Einstein College of Medicine, Bronx, NY. The RSS hosted the "Functional Radiosurgery Workshop" on March 19, 2025 in Tucson, AZ. The RSS hosted the symposia "Advancements in GRID, Lattice, Microbeam and FLASH" on March 19, 2025, in Tucson, AZ. The 2025 RSS Scientific Meeting "Expanding Horizons in SRS, SBRT and Other Advanced Radiotherapy Techniques" was held March 20-22,…
$521,101 spent$508,629 earned by the program64% of program spendingOther program services, not described on the e-filed return.
$0 spent0% of program spending
The 4 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $815,662.
The organization over time
Each line starts at 100 in 2017, so what you read is the shape rather than the size: 150 means half as much again as 2017, 50 means half. The number beside each label in the key is where it ended. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2022 to 2023, from $1.5M to $1.9M (+28%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Government-grant reliance: 2017 0% · 2018 0% · 2019 0% · 2020 0% · 2021 0% · 2022 1% · 2023 0% · 2024 0% · 2025 0%. Grants only. Government contracts and fees sit inside program revenue.
54% of THE RADIOSURGERY SOCIETY’s revenue is contributions — about as donation-reliant as the typical peer (61% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 2 of the last 9 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
Chief executive
Joanne Davis Phd
Executive director
As listed on its FY2025 Form 990.
Who funds it, year by year
2017 → 2019: the base held at 1 funder, grant income fell $40k → $25k.
1 of 1 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 100% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of THE RADIOSURGERY SOCIETY’s funders (the co-funder graph). Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Where its funders are
100% of THE RADIOSURGERY SOCIETY's grant income arrives through donor-advised or pass-through sponsors, whose addresses record where the money is held rather than where the donor is. Too little is directly attributable to place on a map.
Funder states come from each funder’s own filing. $65k arriving through sponsors registered in 1 state is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Against its field
THE RADIOSURGERY SOCIETY runs a healthier operating margin than half of the 2,127 community improvement nonprofits its size.
this organization peer median middle 50% of peers· 2,127 community improvement nonprofits $1M–$10M, FY2025
Organizations like THE RADIOSURGERY SOCIETY
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In California
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
74% of spending goes to programs.
Governance
Footprint & structure
Files a return copy in 1 state
Screen this organization
A dated, signed PDF of the compliance screen for THE RADIOSURGERY SOCIETY: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds THE RADIOSURGERY SOCIETY?
- THE RADIOSURGERY SOCIETY (California) receives grants from 1 organization whose IRS filings report $65,000 to it, the largest being Silicon Valley Community Foundation ($65,000). 1 of them have funded it in more than one year, and 100% of the money arrives through donor-advised or pass-through sponsors rather than from an institution directly.
- How many funders does THE RADIOSURGERY SOCIETY have?
- IRS filings report 1 organization giving $65,000 in grants to THE RADIOSURGERY SOCIETY, 1 of which have funded it in more than one year.
- Who is the largest funder of THE RADIOSURGERY SOCIETY?
- Silicon Valley Community Foundation is the largest funder on record, with $65,000 in grants. The full list of funders is on this page.
- How can an organization like THE RADIOSURGERY SOCIETY find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in California. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
Play a game about who funds Radiosurgery Society →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2017–2025), and the filings of 1 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 14, 2026. What this page cannot tell you · view filing