American Philosophical Society
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 / Humanities Organizations (NTEE)
Donations to this organization are tax deductible.
Summary charts: organization finances over time
Revenue $13.3M (2023)
Expenses $14.2M (2023)
Total Assets $292M (2023)
Total Liabilities $8.22M (2023)
Tax Filings and Audits 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.
Audits are required to be submitted by nonprofit organizations that spend $750,000 or more in federal grant money in a fiscal year. "Single audits" look at the entire organization's finances and compliance, while other audits are program specific. Nonprofit Explorer has PDFs of audits for some nonprofits for fiscal year 2015 and later. Audit data is from the Federal Audit Clearinghouse.
Fiscal Year Ending Dec.
2023
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $3,852,845 |
28.9%
|
| Program Services | $39,458 |
0.3%
|
| Investment Income | $6,439,040 |
48.3%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $38,788 |
0.3%
|
| Net Fundraising | $0 | |
| Sales of Assets | $2,914,340 |
21.9%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $34,471 |
0.3%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $774,349 |
5.4%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $3,595,618 |
25.3%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $292,035,358 | |
| Total Liabilities | $8,222,905 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Dr Robert M Hauser (Exc Officer) | $284,921 | $0 | $29,960 |
| John Wolfe (Financial Offic) | $245,722 | $0 | $34,226 |
| Linda Jacobs (Development Direct) | $187,552 | $0 | $27,916 |
Document Links
990
Filed on Oct. 31, 2024Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2022
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $6,463,558 |
52.6%
|
| Program Services | $62,244 |
0.5%
|
| Investment Income | $5,336,155 |
43.4%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $29,800 |
0.2%
|
| Net Fundraising | $0 | |
| Sales of Assets | $381,570 |
3.1%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $26,147 |
0.2%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $796,422 |
6.0%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $3,290,715 |
25.0%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $267,448,047 | |
| Total Liabilities | $7,857,554 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Patrick Spero (Librarian) | $261,935 | $0 | $42,238 |
| Dr Robert M Hauser (Exc Officer) | $225,370 | $0 | $25,746 |
| John Wolfe (Financial Offic) | $209,565 | $0 | $31,568 |
Document Links
990
Filed on Nov. 6, 2023Primary tax return for a nonprofit’s activities, finances, and governance
990-T
For unrelated business income from activities not substantially related to the organization's tax-exempt purpose
Audit
Audit for an entity that spends $750,000+ in federal grant money in a fiscal year
Fiscal Year Ending Dec.
2021
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $5,766,277 |
18.5%
|
| Program Services | $73,561 |
0.2%
|
| Investment Income | $5,622,835 |
18.0%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $30,828 |
0.1%
|
| Net Fundraising | $0 | |
| Sales of Assets | $19,654,410 |
63.1%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $22,900 |
0.1%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $769,896 |
6.6%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $3,246,875 |
28.0%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $294,142,753 | |
| Total Liabilities | $11,173,728 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Patrick Spero (Librarian) | $253,264 | $0 | $42,238 |
| Dr Robert M Hauser (Exc Officer) | $218,972 | $0 | $24,719 |
| John Wolfe (Financial Offic) | $202,330 | $0 | $28,373 |
Document Links
990
Filed on Nov. 3, 2022Primary tax return for a nonprofit’s activities, finances, and governance
990-T
For unrelated business income from activities not substantially related to the organization's tax-exempt purpose
Audit
Audit for an entity that spends $750,000+ in federal grant money in a fiscal year
Fiscal Year Ending Dec.
2020
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $2,998,084 |
16.8%
|
| Program Services | $73,728 |
0.4%
|
| Investment Income | $7,591,095 |
42.6%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $12,000 |
0.1%
|
| Net Fundraising | $0 | |
| Sales of Assets | $7,138,078 |
40.0%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $15,909 |
0.1%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $760,260 |
6.6%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $3,252,808 |
28.2%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $270,283,272 | |
| Total Liabilities | $11,956,031 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Patrick Spero (Librarian) | $241,365 | $0 | $47,939 |
| Dr Robert M Hauser (Exc Officer) | $214,446 | $0 | $23,485 |
| John Wolfe (Financial Offic) | $200,006 | $0 | $33,019 |
Document Links
990
Filed on Nov. 8, 2021Primary tax return for a nonprofit’s activities, finances, and governance
Audit
Audit for an entity that spends $750,000+ in federal grant money in a fiscal year
Fiscal Year Ending Dec.
2019
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $4,433,408 |
20.4%
|
| Program Services | $90,963 |
0.4%
|
| Investment Income | $6,132,729 |
28.2%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $21,000 |
0.1%
|
| Net Fundraising | $0 | |
| Sales of Assets | $10,971,917 |
50.5%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $64,413 |
0.3%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $730,439 |
6.0%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $3,001,753 |
24.6%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $249,678,183 | |
| Total Liabilities | $9,986,127 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Patrick Spero (Librarian) | $225,383 | $0 | $46,538 |
| Dr Robert M Hauser (Exc Officer) | $207,816 | $0 | $22,991 |
| John Wolfe (Financial Offic) | $194,031 | $0 | $33,680 |
Document Links
990
Filed on Nov. 9, 2020Primary tax return for a nonprofit’s activities, finances, and governance
990-T
For unrelated business income from activities not substantially related to the organization's tax-exempt purpose
Audit
Audit for an entity that spends $750,000+ in federal grant money in a fiscal year
Fiscal Year Ending Dec.
2018
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $2,200,164 |
24.4%
|
| Program Services | $98,014 |
1.1%
|
| Investment Income | $5,250,097 |
58.2%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $1,123 |
0.0%
|
| Net Fundraising | $0 | |
| Sales of Assets | $1,413,782 |
15.7%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $58,666 |
0.7%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $662,809 |
5.7%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $2,872,220 |
24.6%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $216,771,328 | |
| Total Liabilities | $9,372,758 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Dr Robert M Hauser (Exc Officer) | $201,236 | $0 | $16,513 |
| John Wolfe (Financial Offic) | $188,547 | $0 | $35,779 |
| Patrick Spero (Librarian) | $168,459 | $0 | $52,275 |
Document Links
990
Filed on Nov. 11, 2019Primary tax return for a nonprofit’s activities, finances, and governance
990-T
For unrelated business income from activities not substantially related to the organization's tax-exempt purpose
Audit
Audit for an entity that spends $750,000+ in federal grant money in a fiscal year
Fiscal Year Ending Dec.
2017
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $2,075,562 |
15.0%
|
| Program Services | $91,162 |
0.7%
|
| Investment Income | $6,462,991 |
46.8%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $25,042 |
0.2%
|
| Net Fundraising | $0 | |
| Sales of Assets | $5,096,325 |
36.9%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $47,758 |
0.3%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $601,517 |
5.9%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $2,667,582 |
26.0%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $237,124,783 | |
| Total Liabilities | $9,727,740 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| John Wolfe (Financial Offic) | $162,014 | $0 | $33,093 |
| Patrick Spero (Librarian) | $148,632 | $0 | $37,836 |
| Linda Jacobs (Development Direct) | $134,132 | $0 | $21,556 |
Document Links
990
Filed on Oct. 31, 2018Primary tax return for a nonprofit’s activities, finances, and governance
990-T
For unrelated business income from activities not substantially related to the organization's tax-exempt purpose
Audit
Audit for an entity that spends $750,000+ in federal grant money in a fiscal year
Fiscal Year Ending Dec.
2016
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $3,840,450 |
17.7%
|
| Program Services | $109,608 |
0.5%
|
| Investment Income | $6,420,809 |
29.6%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $22,785 |
0.1%
|
| Net Fundraising | $0 | |
| Sales of Assets | $11,205,287 |
51.7%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $79,718 |
0.4%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $577,462 |
6.1%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $2,537,693 |
26.9%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $202,053,801 | |
| Total Liabilities | $7,961,554 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Dr Keith S Thomson (Exc Off/Councl) | $200,935 | $0 | $11,885 |
| John Wolfe (Financial Offic) | $157,338 | $0 | $29,323 |
| Patrick Spero (Librarian) | $144,302 | $0 | $33,679 |
Document Links
990
Filed on Oct. 3, 2017Primary tax return for a nonprofit’s activities, finances, and governance
990-T
For unrelated business income from activities not substantially related to the organization's tax-exempt purpose
Audit
Audit for an entity that spends $750,000+ in federal grant money in a fiscal year
Fiscal Year Ending Dec.
2015
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $3,582,044 |
21.8%
|
| Program Services | $115,569 |
0.7%
|
| Investment Income | $6,659,783 |
40.6%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $8,118 |
0.0%
|
| Net Fundraising | $0 | |
| Sales of Assets | $5,972,895 |
36.4%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $58,674 |
0.4%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $501,965 |
5.7%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $2,661,026 |
30.1%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $189,825,689 | |
| Total Liabilities | $7,495,690 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Dr Keith S Thomson (Exc Off/Councl) | $200,935 | $0 | $11,653 |
| John Wolfe (Financial Offic) | $152,749 | $0 | $29,153 |
| Molly Roth (Develop. Officer) | $125,402 | $0 | $16,047 |
Document Links
990
Filed on Aug. 12, 2016Primary tax return for a nonprofit’s activities, finances, and governance
Audit
Audit for an entity that spends $750,000+ in federal grant money in a fiscal year
Fiscal Year Ending Dec.
2014
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $2,490,457 |
12.8%
|
| Program Services | $100,579 |
0.5%
|
| Investment Income | $4,957,440 |
25.4%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $23,364 |
0.1%
|
| Net Fundraising | $0 | |
| Sales of Assets | $11,870,744 |
60.8%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $74,109 |
0.4%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $581,825 |
5.8%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $2,732,540 |
27.4%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $197,652,256 | |
| Total Liabilities | $7,512,501 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Dr Keith S Thomson (Exc Off/Councl) | $200,219 | $0 | $11,241 |
| Martin Levitt (Librarian) | $165,247 | $0 | $28,657 |
| Nanette Holben (Develop. Officer) | $161,978 | $0 | $17,826 |
Document Links
990
Filed on Aug. 14, 2015Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2013
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $2,011,635 |
11.7%
|
| Program Services | $137,199 |
0.8%
|
| Investment Income | $4,672,397 |
27.1%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $3,856 |
0.0%
|
| Net Fundraising | $0 | |
| Sales of Assets | $10,386,220 |
60.2%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $54,081 |
0.3%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $561,681 |
6.2%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $2,501,499 |
27.8%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $188,349,702 | |
| Total Liabilities | $5,797,771 |
Compensation
| Key Employees and Officers | Compensation | Related | Other |
|---|---|---|---|
| Dr Keith S Thomson (Exc Off/Councl) | $192,274 | $0 | $12,602 |
| Martin Levitt (Librarian) | $157,870 | $0 | $25,628 |
| Nanette Holben (Develop. Officer) | $144,179 | $0 | $13,389 |
Document Links
990
Filed on Sept. 11, 2014Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2012
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $2,917,400 |
33.1%
|
| Program Services | $126,018 |
1.4%
|
| Investment Income | $4,707,446 |
53.4%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $15,080 |
0.2%
|
| Net Fundraising | $0 | |
| Sales of Assets | $990,461 |
11.2%
|
| Net Inventory Sales | $0 | |
| Other Revenue | $51,005 |
0.6%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $548,927 |
6.5%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $2,375,146 |
28.2%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $165,945,840 | |
| Total Liabilities | $6,971,960 |
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2011
Extracted Financial Data
Extracted Financial Data from Form 990
| Notable Sources of Revenue | Percent of Total Revenue | |
|---|---|---|
| Contributions | $4,847,525 |
77.4%
|
| Program Services | $134,303 |
2.1%
|
| Investment Income | $3,428,076 |
54.7%
|
| Bond Proceeds | $0 | |
| Royalties | $0 | |
| Rental Property Income | $29,846 |
0.5%
|
| Net Fundraising | $0 | |
| Sales of Assets | -$2,234,610 | |
| Net Inventory Sales | $0 | |
| Other Revenue | $59,838 |
1.0%
|
| Notable Expenses | Percent of Total Expenses | |
|---|---|---|
| Executive Compensation | $517,857 |
5.2%
|
| Professional Fundraising Fees | $0 | |
| Other Salaries and Wages | $2,337,493 |
23.5%
|
| Assets/Debt | ||
|---|---|---|
| Total Assets | $147,804,979 | |
| Total Liabilities | $6,278,561 |
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2010
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2009
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2008
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2007
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2006
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2005
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2004
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2003
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2002
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
Fiscal Year Ending Dec.
2001
No Extracted Financial Data
Extracted financial data is not available for the forms filed in this tax period, but Form 990 documents are available for download.
Document Links
990
Primary tax return for a nonprofit’s activities, finances, and governance
About 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.