Skip to content
Nonprofiteer
← All organizations

INTERNATIONAL SOCIETY FOR THE STUDY OF VASCULAR ANOMALIES

EIN 46-4900421 MILWAUKEE, WI

Largest nonprofits in Wisconsin

Revenue 2024
$875,060
Expenses 2024
$828,786

Program services were 88.7% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
G43
Classification
2000
Street
555 E WELLS ST STE 1100

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Other organizations at this address

40 other organizations in the IRS Business Master File list the same street address. matched by us

This address is a suite or unit (STE 1100). Organizations that share one are often clients of the same office-services firm, accountant or registered agent rather than related to each other.

We match the street line and ZIP code as the IRS gives them, ignoring case and outer spaces and nothing else, so "AVE" and "AVENUE" count as different streets and this list can miss some. A shared address can mean related organizations or a shared office, but it can also be a registered agent, a mail drop or a service provider holding mail for unrelated clients. It is not, by itself, evidence that two organizations are connected.

Mission and programs · 2024

Mission

ISSVA IS A MULTIDISCIPLINARY INTERNATIONAL SOCIETY OF PHYSICIANS, SCIENTISTS, AND HEALTH CARE PROVIDERS UNITED BY AN INTEREST IN VASCULAR ANOMALIES. ISSVA AIMS TO PROMOTE THE HIGHEST STANDARDS OF CARE FOR PATIENTS WITH VASCULAR ANOMALIES BY ADVANCING CLINICAL AND SCIENTIFIC KNOWLEDGE CONCERNING CAUSES, DIAGNOSIS AND TREATMENT, AND BY EDUCATION OF PHYSICIANS, HEALTH CARE PROVIDERS, PATIENTS AND THE COMMUNITY.

Activities or mission (Part I)

ISSVA IS A MULTIDISCIPLINARY INTERNATIONAL SOCIETY OF PHYSICIANS, SCIENTISTS, AND HEALTH CARE PROVIDERS UNITED BY AN INTEREST IN VASCULAR ANOMALIES. THE SOCIETY AIMS TO PROMOTE THE HIGHEST STANDARDS OF CARE FOR PATIENTS WITH VASCULAR ANOMALIES BY ADVANCING CLINICAL AND SCIENTIFIC KNOWLEDGE CONCERNING CAUSES, DIAGNOSIS AND TREATMENT, AND BY EDUCATION OF PHYSICIANS, HEALTH CARE PROVIDERS, PATIENTS AND THE COMMUNITY. THE SOCIETY ENCOURAGES THE FREE FLOW OF INFORMATION BETWEEN ITS MEMBERS AND INTERESTED GROUPS, THROUGH WORKSHOP MEETINGS AND TEACHING PROGRAMS, AND BY THE DISSEMINATION OF A CLASSIFICATION SCHEME AND PERTINENT SCIENTIFIC DATA.

  • ANNUAL MEETING - PROVIDE THE OPPORTUNITY TO LEARN THROUGH A MULTI-DISCIPLINARY APPROACH AND WILL BE ATTENDED BY A WIDE ARRAY OF SPECIALISTS SUCH AS DERMATOLOGISTS, INTERVENTIONAL RADIOLOGISTS, HEMATOLOGISTS/ONCOLOGISTS, PLASTIC SURGEONS, OTOLARYNGOLOGISTS, BASIC SCIENTISTS, OTHER SURGEONS, GENETICS, PATHOLOGISTS, NURSES, ETC.

    Expenses $721,520 · Revenue $735,985

  • MISCELLANEOUS PROGRAM SERVICES, INCLUDING JOURNAL PUBLICATIONS AND MEMBERSHIP DUES.

    Expenses $13,262 · Revenue $121,929

As filed on the 2024 return. The filer continues this part on Schedule O, which is not shown here.

Officers and directors · 2024

As listed in Part VII of the 2024 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • Leo Schultze Kool

    PRESIDENT

    Total calculated
    $0
    Hours/week
    3

  • Francine Blei

    PAST PRESIDENT

    Total calculated
    $0
    Hours/week
    1

  • Maria Garzon

    TREASURER

    Total calculated
    $0
    Hours/week
    1

  • Juan-Carlos Lopez-Gutierrez

    PRESIDENT-ELECT

    Total calculated
    $0
    Hours/week
    1

  • Denise Adams

    SECRETARY

    Total calculated
    $0
    Hours/week
    1

  • Miikka Vikkula

    VICE PRESIDENT

    Total calculated
    $0
    Hours/week
    1

  • Dov Goldenberg

    SCIENTIFIC COMMITTEE CHAIR

    Total calculated
    $0
    Hours/week
    1

  • Gresham Richter

    EDITOR-IN-CHIEF

    Total calculated
    $0
    Hours/week
    1

  • Michel Wassef

    MEMBER AT LARGE

    Total calculated
    $0
    Hours/week
    1

  • Annouk Bisdorff

    MEMBER AT LARGE

    Total calculated
    $0
    Hours/week
    1

  • Eulalia Baselga

    MEMBER AT LARGE

    Total calculated
    $0
    Hours/week
    1

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. Earlier years are each on their own filing page.

Filings

  • 2024
    Revenue
    $875,060
    Expenses
    $828,786
    Contributions
    $8,535
    Grants paid
    $0
  • 2023
    Revenue
    $419,613
    Expenses
    $369,949
    Contributions
    $15,868
    Grants paid
    $0
  • 2022
    Revenue
    $652,718
    Expenses
    $454,896
    Contributions
    $13,038
    Grants paid
    $0

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Other returns filed

  • 2021 · 990

    Revenue
    $316,047
    Expenses
    $150,322
    Assets (EOY)
    $605,163

  • 2020 · 990

    Revenue
    $271,618
    Expenses
    $100,599
    Assets (EOY)
    $384,388

  • 2019 · 990-EZ

    Revenue
    $50,810
    Expenses
    $41,339
    Assets (EOY)
    $223,500

  • 2018 · 990-EZ

    Revenue
    $91,868
    Expenses
    $47,622
    Assets (EOY)
    $184,071

Nonprofiteer parses Forms 990, 990-EZ and 990-PF, in a window of recent tax years. These returns are recorded from the IRS e-file index, so their figures were extracted by that index rather than read from the return here — treat them as a different source from the filings above, not as more of the same record. A dash means the index carries no figure; Form 990-T listings carry none at all.

Form 990-N e-Postcard, tax year 2017

Tax period
1 January 2017 to 31 December 2017
Principal officer
Ilona Frieden
Mailing address
555 E WELLS STREET SUITE 1100MILWAUKEE WI 53202
Website
http://www.issva.org

As filed, from the IRS e-Postcard file of 26 October 2026. The IRS publishes only each organization's most recent postcard, so earlier years are not shown. A 990-N carries no financial detail. The postcard also gives the principal officer's address, which is not shown here.

Grants made

No itemized grants to organizations. Schedule I is filed only by organizations that granted more than $5,000 to a recipient, so most filers have none.

Grants received

No itemized grant names this organization as a recipient. Only grants over $5,000 are itemized, and only by filers of the full Form 990.

Other IRS files

Auto-Revocation List

Not listed. The IRS publishes this list for organizations whose exemption was automatically revoked for failing to file for three consecutive years.

Publication 78

Listed as of 13 October 2026, under deductibility PC.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.

What this page reflects

The registration facts above come from the IRS Business Master File published 13 October 2026 and read 1 November 2026, for every organization at once. Returns through tax year 2024, the newest we have parsed for this organization.