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Aristides De Sousa Mendes Foundation Us

Sousa Mendes Foundation
  • Greenlawn, NY
  • Tax-exempt since Jan. 2011
  • EIN: 27-3630528

Organization summary

Type of Nonprofit

Designated as a Organizations for any of the following purposes: religious, educational, charitable, scientific, literary, testing for public safety, fostering national or international amateur sports competition (as long as it doesn't provide athletic facilities or equipment), or the prevention of cruelty to children or animals.

Category: Arts, Culture and Humanities / Historical Societies, Related Historical Activities (NTEE)

Donations to this organization are tax deductible.

Summary charts: organization finances over time

Revenue
$190k (2025)

Expenses
$235k (2025)

Total Assets
$252k (2025)

Total Liabilities
$88.1k (2025)

Source: Form 990 tax filings from 2014 to 2025

Tax Filings by Year

Form 990 is an information return that most organizations claiming federal tax-exempt status must file yearly with the IRS. Nonprofit Explorer has IRS digitized Form 990 data for filings processed in 2012 and later. If this organization filed an amended return, it may not be reflected below. Duplicate download links may indicate a resubmission or amendment to this organization's original return. Form 990 data is from the IRS.

Fiscal Year Ending June
2025

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$189,751
Expenses
$235,448
Net Income
-$45,697
Net Assets
$164,176
Notable Sources of Revenue Percent of Total Revenue
Contributions $176,008
92.8%
Program Services $9,242
4.9%
Investment Income $78
0.0%
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $4,423
2.3%
Notable Expenses Percent of Total Expenses
Executive Compensation $51,004
21.7%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $252,291
Total Liabilities $88,115
Net Assets $164,176
Compensation
Key Employees and Officers Compensation Related Other
Olivia Mattis Phd (Board President And Ceo) $51,004 $0 $0
Leah Sills (Board Member) $0 $0 $0
Mariana Abrantes De Sousa (Secretary) $0 $0 $0
Monique Rubens Krohn (Chair) $0 $0 $0
Mordecai Paldiel Phd (Board Member) $0 $0 $0
Diane Hartz Warsoff (Treasurer) $0 $0 $0
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Document Links

990
Filed on Nov. 14, 2025

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending June
2024

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$292,011
Expenses
$261,867
Net Income
$30,144
Net Assets
$209,874
Notable Sources of Revenue Percent of Total Revenue
Contributions $169,311
58.0%
Program Services $122,700
42.0%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $51,004
19.5%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $213,339
Total Liabilities $3,465
Net Assets $209,874
Compensation
Key Employees and Officers Compensation Related Other
Olivia Mattis Phd (Board President And Ceo) $51,004 $0 $0
Leah Sills (Board Member) $0 $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0 $0
Monique Rubens Krohn (Secretary) $0 $0 $0
Mordecai Paldiel Phd (Board Member) $0 $0 $0
Joan Arnay Halperin (Board Member) $0 $0 $0
+ View more people

Document Links

990
Filed on April 13, 2025

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending June
2023

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$168,668
Expenses
$181,833
Net Income
-$13,165
Net Assets
$179,730
Notable Sources of Revenue Percent of Total Revenue
Contributions $156,614
92.9%
Program Services $10,290
6.1%
Investment Income $0
Bond Proceeds $0
Royalties $112
0.1%
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $1,099
0.7%
Other Revenue $553
0.3%
Notable Expenses Percent of Total Expenses
Executive Compensation $51,004
28.0%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $304,359
Total Liabilities $124,629
Net Assets $179,730
Compensation
Key Employees and Officers Compensation Related Other
Olivia Mattis Phd (President And Coo) $51,004 $0 $51,004
Leah Sills (Board Member) $0 $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0 $0
Monique Rubens Krohn (Vice President) $0 $0 $0
Mordecai Paldiel Phd (Board Member) $0 $0 $0
Daniel Subotinik Esq (Board Member) $0 $0 $0
Joan Arnay Halperin (Board Member) $0 $0 $0
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Document Links

990
Filed on April 8, 2024

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending June
2022

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$201,857
Expenses
$174,532
Net Income
$27,325
Net Assets
$192,895
Notable Sources of Revenue Percent of Total Revenue
Contributions $186,428
92.4%
Program Services $12,933
6.4%
Investment Income $0
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $2,496
1.2%
Notable Expenses Percent of Total Expenses
Executive Compensation $45,000
25.8%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $194,324
Total Liabilities $1,429
Net Assets $192,895
Compensation
Key Employees and Officers Compensation Related Other
Olivia Mattis Phd (President And Coo) $47,000 $0 $0
Leah Sills (Board Member) $0 $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0 $0
Monique Rubens Krohn (Vice President) $0 $0 $0
Mordecai Paldiel Phd (Board Member) $0 $0 $0
Daniel Subotinik Esq (Board Member) $0 $0 $0
Joan Arnay Halperin (Board Member) $0 $0 $0
+ View more people

Document Links

990
Filed on Feb. 8, 2023

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending June
2021

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$164,541
Expenses
$134,771
Net Income
$29,770
Net Assets
$165,570
Notable Sources of Revenue Percent of Total Revenue
Contributions $150,743
91.6%
Program Services $13,786
8.4%
Investment Income $12
0.0%
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $40,628
30.1%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $167,706
Total Liabilities $2,136
Net Assets $165,570
Compensation
Key Employees and Officers Compensation Related Other
Olivia Mattis Phd (President And Coo) $40,628 $0 $0
Leah Sills (Vice President) $0 $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0 $0
Monique Krohn (Secretary) $0 $0 $0
Mordecai Paldiel Phd (Board Member) $0 $0 $0
Daniel Subotinik Esq (Board Member) $0 $0 $0
+ View more people

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990
Filed on May 16, 2022

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending June
2020

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$129,384
Expenses
$146,543
Net Income
-$17,159
Net Assets
$135,800
Notable Sources of Revenue Percent of Total Revenue
Contributions $118,224
91.4%
Program Services $11,135
8.6%
Investment Income $25
0.0%
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $30,192
20.6%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $142,499
Total Liabilities $6,699
Net Assets $135,800
Compensation
Key Employees and Officers Compensation Related Other
Olivia Mattis Phd (President And Coo) $30,192 $0 $0
Leah Sills (Vice President) $0 $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0 $0
Monique Krohn (Secretary) $0 $0 $0
Mordecai Paldiel Phd (Board Member) $0 $0 $0
Daniel Subotinik Esq (Board Member) $0 $0 $0
+ View more people

Document Links

990
Filed on May 16, 2021

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
XML

Fiscal Year Ending June
2019

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$118,521
Expenses
$107,378
Net Income
$11,143
Net Assets
$152,959
Notable Sources of Revenue Percent of Total Revenue
Contributions $36,553
30.8%
Program Services $81,938
69.1%
Investment Income $30
0.0%
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $0
Notable Expenses Percent of Total Expenses
Executive Compensation $22,659
21.1%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $155,256
Total Liabilities $2,297
Net Assets $152,959
Compensation
Key Employees and Officers Compensation Related Other
Olivia Mattis Phd (President And Coo) $22,660 $0 $0
Leah Sills (Vice President) $0 $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0 $0
Monique Krohn (Secretary) $0 $0 $0
Mordecai Paldiel Phd (Board Member) $0 $0 $0
Daniel Subotinik Esq (Board Member) $0 $0 $0
+ View more people

Document Links

990
Filed on Oct. 9, 2020

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending June
2018

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$163,614
Expenses
$150,946
Net Income
$12,668
Net Assets
$141,816
Notable Sources of Revenue Percent of Total Revenue
Contributions $117,081
71.6%
Program Services $37,557
23.0%
Investment Income $31
0.0%
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $7,991
4.9%
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $954
0.6%
Notable Expenses Percent of Total Expenses
Executive Compensation $42,126
27.9%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $143,299
Total Liabilities $1,483
Net Assets $141,816
Compensation
Key Employees and Officers Compensation Related Other
Olivia Mattis Phd (President And Coo) $27,192 $0 $0
Leah Sills (Vice President) $0 $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0 $0
Monique Krohn (Secretary) $0 $0 $0
Mordecai Paldiel Phd (Board Member) $0 $0 $0
Daniel Subotnik Esq (Board Member) $0 $0 $0
+ View more people

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990
Filed on May 15, 2019

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending June
2017

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$115,588
Expenses
$149,525
Net Income
-$33,937
Net Assets
$124,735
Notable Sources of Revenue Percent of Total Revenue
Contributions $51,905
44.9%
Program Services $57,423
49.7%
Investment Income $33
0.0%
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $1,132
1.0%
Other Revenue $5,095
4.4%
Notable Expenses Percent of Total Expenses
Executive Compensation $26,200
17.5%
Professional Fundraising Fees $0
Other Salaries and Wages $0
Assets/Debt
Total Assets $127,539
Total Liabilities $2,804
Net Assets $124,735
Other
Reported conflict of interest transactions
Compensation
Key Employees and Officers Compensation Related Other
Olivia Mattis (President And Coo) $45,106 $0 $0
Gerald Mendes (Chair) $0 $0 $0
Daniel Subotnik (Vice President) $0 $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0 $0
Leah Sills (Secretary) $0 $0 $0
Monique Krohn (Board Member At Large) $0 $0 $0
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990
Filed on May 15, 2018

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending June
2016

Extracted Financial Data

Extracted Financial Data from Form 990
Revenue
$219,094
Expenses
$144,977
Net Income
$74,117
Net Assets
$158,672
Notable Sources of Revenue Percent of Total Revenue
Contributions $100,603
45.9%
Program Services $106,297
48.5%
Investment Income $28
0.0%
Bond Proceeds $0
Royalties $0
Rental Property Income $0
Net Fundraising $11,585
5.3%
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $581
0.3%
Notable Expenses Percent of Total Expenses
Executive Compensation $0
Professional Fundraising Fees $2,575
1.8%
Other Salaries and Wages $0
Assets/Debt
Total Assets $178,887
Total Liabilities $20,215
Net Assets $158,672
Compensation
Key Employees and Officers Compensation Related Other
Dr Olivia Mattis (President & Ceo) $8,100 $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0 $0
Joan Halperin (Secretary) $0 $0 $0
Gerald Mendes (Chairman) $0 $0 $0
Daniel Subotnik Esq (Vice President) $0 $0 $0
+ View more people

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990
Filed on Nov. 2, 2016

Primary tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending June
2015

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$41,929
Expenses
$38,282
Net Income
$3,647
Net Assets
$84,555
Notable Sources of Revenue Percent of Total Revenue
Contributions $31,361
74.8%
Program Services $10,464
25.0%
Investment Income $23
0.1%
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $81
0.2%
Assets/Debt
Total Assets $84,681
Total Liabilities $126
Net Assets $84,555
Compensation
Key Employees and Officers Compensation Other
Dr Olivia Mattis (President) $0 $0
Mariana Abrantes De Sousa (Treasurer) $0 $0
Gerald Mendes (Secretary) $0 $0

Document Links

990-EZ
Filed on Nov. 13, 2015

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

Fiscal Year Ending June
2014

Extracted Financial Data

Extracted Financial Data from 990-EZ
Revenue
$64,220
Expenses
$26,085
Net Income
$38,135
Net Assets
$80,908
Notable Sources of Revenue Percent of Total Revenue
Contributions $50,410
78.5%
Program Services $13,743
21.4%
Investment Income $7
0.0%
Net Fundraising $0
Sales of Assets $0
Net Inventory Sales $0
Other Revenue $60
0.1%
Assets/Debt
Total Assets $80,908
Total Liabilities $0
Net Assets $80,908
Compensation
Key Employees and Officers Compensation Other
Dr Olivia Mattis (President) $0 $0
Harry Oesterreicher (Secretary / Treasurer) $0 $0

Document Links

990-EZ
Filed on Nov. 14, 2014

Short form tax return for a nonprofit’s activities, finances, and governance

View Filing
PDF XML

About This Data

What Is This Data?

Nonprofit Explorer includes summary data for nonprofit tax returns and full Form 990 documents, in both PDF and digital formats.

The summary data contains information processed by the IRS during the 2012-2019 calendar years; this generally consists of filings for the 2011-2018 fiscal years, but may include older records. This data release includes only a subset of what can be found in the full Form 990s.

In addition to the raw summary data, we link to PDFs and digital copies of full Form 990 documents wherever possible. This consists of separate releases by the IRS of Form 990 documents processed by the agency, which we update regularly.

We also link to copies of audits nonprofit organizations that spent $750,000 or more in Federal grant money in a single fiscal year since 2016. These audits are copied from the Federal Audit Clearinghouse.

Which Organizations Are Here?

Every organization that has been recognized as tax exempt by the IRS has to file Form 990 every year, unless they make less than $200,000 in revenue and have less than $500,000 in assets, in which case they have to file form 990-EZ. Organizations making less than $50,000 don’t have to file either form but do have to let the IRS they’re still in business via a Form 990N "e-Postcard."

Nonprofit Explorer has organizations claiming tax exemption in each of the 27 subsections of the 501(c) section of the tax code, and which have filed a Form 990, Form 990EZ or Form 990PF. Taxable trusts and private foundations that are required to file a form 990PF are also included. Small organizations filing a Form 990N "e-Postcard" are not included in this data.

Types of Nonprofits

There are 27 nonprofit designations based on the numbered subsections of section 501(c) of the tax code. See the list »

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For those interested in acquiring the original data from the source, here’s where our data comes from:

  • Raw filing data. Includes EINs and summary financials as structured data.
  • Exempt Organization profiles. Includes organization names, addresses, etc. You can merge this with the raw filing data using EIN numbers.
  • Form 990 documents. Prior to 2017, these documents were obtained and processed by Public.Resource.org and ProPublica. Bulk PDF downloads since 2017 are available from the IRS.
  • Form 990 documents as XML files. Includes complete filing data (financial details, names of officers, tax schedules, etc.) in machine-readable format. Only available for electronically filed documents. Electronic data released prior to October 2021 is also available through Amazon Web Services.
  • Audits. PDFs of single or program-specific audits for nonprofit organizations that spent $750,000 or more in Federal grant money in a single fiscal year. Available for fiscal year 2015 and later.

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Nonprofit Explorer

Browse millions of annual returns filed by tax-exempt organizations with ProPublica’s Nonprofit Explorer. See details like executive compensation, revenue, expenses and more. Search for an organization or a person, or search the full text of filings.

By Andrea Suozzo, Alec Glassford, Ash Ngu and Brandon Roberts.

Design by Jeff Frankl. Additional development by Ken Schwencke, Mike Tigas, and Sisi Wei.

E-file viewer adapted from IRS e-File Viewer by Ben Getson. Code for scraping audit documents adapated from Govwiki.

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