Nonprofit · EIN 04-3146650
INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY
Also known as A
Tax-exempt · GAINESVILLE, FL 32605
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| September 30, 2025 | 990 | $404,880 | $254,344 | $150,536 | $698,361 | $0 | $698,361 |
| September 30, 2024 | 990 | $471,824 | $501,572 | -$29,748 | $547,825 | $0 | $547,825 |
| September 30, 2023 | 990 | $160,269 | $222,048 | -$61,779 | $579,706 | $2,133 | $577,573 |
Financial details: 990 for the year ended September 30, 2025
Revenue
- Contributions, gifts and grants
- $0
- Program service revenue
- $404,880
- Investment income
- $0
- Other revenue
- $0
Expenses
- Grants and similar amounts paid
- $953
- Salaries, compensation and benefits (total)
- $0
- Professional fundraising fees
- $0
- Legal fees
- $30,680
- Accounting fees
- $4,150
Balance sheet and other
- Total assets, start of year
- $547,825
- Total assets, end of year
- $698,361
- Total liabilities, end of year
- $0
- Net assets, end of year
- $698,361
- Gross receipts
- $404,880
- Employees
- 0
- Year formed
- 1991
- State of legal domicile
- PA
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended September 30, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| JASON SHEEHAN | PRESIDENT Officer | – | $0 |
| THIERRY GEVAERT | VICE PRESIDE Officer | – | $0 |
| THOMAS ZILLI | SECRETARY Officer | – | $0 |
| MARC LEVIVIER MD | TREASURER Officer | – | $0 |
| ARJUN SAGHAL | PAST PRESIDE Officer | – | $0 |
| CHRISTOS BOSKOS | DIRECTOR Trustee or director | – | $0 |
| CHRISTOPHER CIFARELLI | DIRECTOR Trustee or director | – | $0 |
| ELENA DE MARTIN | DIRECTOR Trustee or director | – | $0 |
| KATARZYNA JERZAK | DIRECTOR Trustee or director | – | $0 |
| JUSTIN CHENG-CHIA LEE | DIRECTOR Trustee or director | – | $0 |
| VICTOR LEE | DIRECTOR Trustee or director | – | $0 |
| SELCUK PEKER | DIRECTOR Trustee or director | – | $0 |
| DANIEL TAN | DIRECTOR Trustee or director | – | $0 |
990 for the year ended September 30, 2024: 13 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| ARJUN SAGHAL | PRESIDENT Officer | – | $0 |
| JASON SHEEHAN | VICE PRESIDE Officer | – | $0 |
| THIERRY GEVAERT | SECRETARY Officer | – | $0 |
| CECELIA GZELL | TREASURER Officer | – | $0 |
| MARC LEVIVIER MD | PAST PRESIDE Officer | – | $0 |
| VERONICA CHIANG | DIRECTOR Trustee or director | – | $0 |
| ELENA DE MARTIN | DIRECTOR Trustee or director | – | $0 |
| ALESSANDRA GORGULHO | DIRECTOR Trustee or director | – | $0 |
| SELCUK PEKER | DIRECTOR Trustee or director | – | $0 |
| DANIEL TAN | DIRECTOR Trustee or director | – | $0 |
| DANIEL TRIFILETTI | DIRECTOR Trustee or director | – | $0 |
| SHOJI YOMO | DIRECTOR Trustee or director | – | $0 |
| THOMAS ZILLI | DIRECTOR Trustee or director | – | $0 |
990 for the year ended September 30, 2023: 13 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| CAROLINE CHUNG | DIRECTOR Trustee or director | – | $0 |
| HYUN-TAI CHUNG | DIRECTOR Trustee or director | – | $0 |
| ALESSANDRA GORGULHO | DIRECTOR Trustee or director | – | $0 |
| CECELIA GZELL | DIRECTOR Trustee or director | – | $0 |
| DANIEL TRIFILETTI | DIRECTOR Trustee or director | – | $0 |
| CONSTANTIN TULEASCA | DIRECTOR Trustee or director | – | $0 |
| SOJI YOMO | DIRECTOR Trustee or director | – | $0 |
| CHUNG-PING YU | DIRECTOR Trustee or director | – | $0 |
| THIERRY GEVAERT | TREASURER Officer | – | $0 |
| LAURA FARISELLI MD | PAST PRESIDE Officer | – | $0 |
| MARC LEVIVIER MD | PRESIDENT Officer | – | $0 |
| ARJUN SAHGAL | VICE PRESIDE Officer | – | $0 |
| JASON SHEEHAN | SECRETARY Officer | – | $0 |
Address and contacts
- Address (IRS master file)
- C/O JONES CPAS 925 NW 56TH TER C, GAINESVILLE, FL 32605-0000
- In care of
- % MCDAVID & CO
- Principal officer (990 for 2024)
- JASON SHEEHAN
- Signed the 990
- JASON SHEEHAN, PRESIDENT
- Phone
- (352) 373-1080
- Website
- WWW.ISRSY.ORG
- Return prepared by
- JONES CPAS & ADVISORS INC
Mission
THE INTERNATIONAL STEREOTACTIC RADIOSURGERY SOCIETY (ISRS) WAS FOUNDED AS A WORLDWIDE ORGANIZATION IN 1991 AND REMAINS THE ONLY PROFESSIONAL BODY OF ITS KIND. CREATED TO FOSTER LEARNING AND RESEARCH ON THE TOPICS OF BRAIN AND BODY RADIOSURGERY, THE SOCIETY IS HIGHLY DEDICATED TO: 1. PROMOTING TECHNICAL DEVELOPMENTS IN STEREOTACTIC RADIOSURGERY 2. PROMOTING THE HIGHEST LEVELS OF CLINICAL EXPERTISE 3. CONVENING EVERY TWO YEARS AT THE ISRS CONGRESS. THE ISRS FOSTERS TECHNICAL DEVELOPMENT AND RESEARCH ON THE TOPICS OF BRAIN AND BODY RADIOSURGERY BY HOLDING BIENNIAL CONGRESSES, MAINTAINING A WEBSITE, AND OTHER ACTIVITIES TO ENCOURAGE THE EXCHANGE OF INFORMATION.
Program accomplishments
- THE ISRS ORGANIZES AND HOLDS A BIENNIAL CONGRESS TO ENCOURAGE INTERACTION AMONG INTERNATIONAL COMMUNITIES OF HEALTHCARE PROFESSIONALS DEDICATED TO THE ADVANCEMENT OF STEREOTACTIC RADIOSURGERY AND TO GIVE THEM THE OPPORTUNITY TO BROADEN AND DEVELOP THEIR KNOWLEDGE WITH FELLOW PROFESSIONALS. IN ADDITION TO OTHER ACTIVITIES AT THE BIENNIAL CONGRESS, THE ISRS MAKES CERTAIN AWARDS FOR CONTRIBUTIONS IN THE FIELD OF RADIOSURGERY, SCIENTIFIC PAPERS, AND POSTERS. DURING THIS YEAR, THE ORGANIZATION WAS PREPARING FOR ITS NEXT CONGRESS, TO BE HELD IN MAY 2026 IN SYDNEY, AUSTRALIA. OVER 700 NEUROSURGEIONS, RADIATION ONCOLOGISTS, MEDICAL PHYSICISTS, AND OTHERS FROM OVER 55 COUNTRIES WERE PRESENT AT THE MAY, 2024 BIENNIAL CONGRESS IN NEW YORK CITY. IN ALTERNATE YEARS, ISRS ORGANIZES INTERIM MEETINGS TO MAINTAIN CURRENCY IN EDUCATION FOR ITS MEMBERS.
- THE ISRS WEBSITE IS REGULARLY UPDATED WITH NEWSFEEDS TO ATTRACT MORE MEMBERS FROM THE SECTOR. NEWSLETTERS ARE SENT BY EMAIL TO ALL ISRS MEMBERS.
- ISRS ORGANIZES NUMEROUS WEBINARS AS PART OF ITS EDUCATIONAL ACTIVITIES TO EXPAND AND UPDATE ITS MEMBERS' KNOWLEDGE AND SKILL.
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in September, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | September 30, 2026 | February 16, 2027 | Not due yet |
| 2024 | September 30, 2025 | February 17, 2026 | 990 on file |
| 2023 | September 30, 2024 | February 18, 2025 | 990 on file |
IRS record
- EIN
- 04-3146650
- Tax-exempt status
- 501(c)(6): Business league or chamber of commerce
- Donations deductible
- No
- Exempt since
- 1994
- Accounting year ends
- September
- Files
- Form 990 or 990-EZ
- Assets (IRS master file)
- $698,361
- Income (IRS master file)
- $404,880
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | September 2025 | $404,880 | $254,344 | $698,361 | XML |
| 990 | September 2024 | $471,824 | $501,572 | $547,825 | XML |
| 990 | September 2023 | $160,269 | $222,048 | $579,706 | XML |
| 990 | September 2022 | $193,207 | $157,333 | $639,352 | IRS |
| 990 | September 2021 | – | – | – | IRS |
| 990 | September 2020 | – | – | – | IRS |
| 990 | September 2019 | – | – | – | IRS |
| 990 | September 2018 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 04-3146650).
Questions about INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY
- What is the EIN of INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY?
- The employer identification number (EIN) of INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY is 04-3146650.
- Is INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(6) since 1994.
- Are donations to INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY tax-deductible?
- No. The IRS master file says contributions to it are not deductible.
- Which annual return does INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY due?
- The return for tax year 2025 (the year ending September 30, 2026) is due February 16, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended September 2025.
- Who is the principal officer of INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY?
- The 990 for the year ended September 30, 2025 names JASON SHEEHAN.
- Who are the officers and directors of INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY?
- The 990 for the year ended September 30, 2025 lists 13 people; 0 received compensation from the organization.
- How much revenue does INTERNATIONAL STEREOTACTIC RADIO SURGERY SOCIETY have?
- On its 990 for the year ended September 30, 2025 it reported revenue of $404,880, expenses of $254,344 and total assets of $698,361 at year end.
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