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AMERICAN PHILOSOPHICAL SOCIETY

EIN 23-1353269 PHILADELPHIA, PA

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Revenue 2024
$20,391,804
Expenses 2024
$15,571,638

Program services were 72.6% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
A700
Classification
2300
Street
104 S 5TH ST

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).

Mission and programs · 2024

Mission

The American Philosophical Society, the oldest learned society in the United States, was founded in 1743 by Benjamin Franklin for the purpose of "promoting useful knowledge." In the 21st century the Society sustains this mission in three principal ways. It honors and engages distinguished scientists, humanists, social scientists, and leaders in civic and cultural affairs through elected membership and opportunities for interdisciplinary, intellectual fellowship, particularly in the semi-annual Meetings in Philadelphia. It supports research and discovery through grants and fellowships, lectures, publications, prizes, exhibitions, and public education. It serves scholars through a research library of manuscripts and other collections internationally recognized for their enduring historic value. The American Philosophical Society's current activities reflect the founder's spirit of inquiry, provide a forum for the free exchange of ideas, and convey the conviction of its members that intel

Activities or mission (Part I)

The American Philosophical Society, the oldest learned society in the United States, was founded in 1743 by Benjamin Franklin for the purpose of "promoting useful knowledge." In the 21st century the Society sustains this mission with various programs described further within.

  • The Society's printed Yearbook for 2024 gives a complete account of the Society's activities. A copy will be furnished upon request. Details concerning contributions and research grants are on hand and are available for inspection at the Society's office.

    Expenses $11,302,992 · Grants $1,754,046 · Revenue $150,943

As filed on the 2024 return.

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.

  • Dr Robert M Hauser

    CEO

    Total calculated
    $376,275
    From this org
    $341,000
    From related orgs
    $0
    Other
    $35,275
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $341,000
    Bonus
    not reported
    Other
    not reported
    Deferred
    $27,280
    Nontaxable benefits
    $7,995
    Filer's total
    $376,275

  • Michelle McDonald

    Dir of Library

    Total calculated
    $301,818
    From this org
    $257,373
    From related orgs
    $0
    Other
    $44,445
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $257,373
    Bonus
    not reported
    Other
    not reported
    Deferred
    $16,500
    Nontaxable benefits
    $27,945
    Filer's total
    $301,818

  • John Wolfe

    Financial Offic

    Total calculated
    $300,742
    From this org
    $251,750
    From related orgs
    $0
    Other
    $48,992
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $251,750
    Bonus
    not reported
    Other
    not reported
    Deferred
    $5,793
    Nontaxable benefits
    $43,199
    Filer's total
    $300,742

  • Dr Patrick Spero

    CEO

    Total calculated
    $260,930
    From this org
    $231,916
    From related orgs
    $0
    Other
    $29,014
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $231,916
    Bonus
    not reported
    Other
    not reported
    Deferred
    $15,000
    Nontaxable benefits
    $14,014
    Filer's total
    $260,930

  • Linda Jacobs

    Development Direct

    Total calculated
    $222,211
    From this org
    $192,610
    From related orgs
    $0
    Other
    $29,601
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $192,610
    Bonus
    not reported
    Other
    not reported
    Deferred
    $15,408
    Nontaxable benefits
    $14,193
    Filer's total
    $222,211

  • Gary David

    Asso Dir of Collec

    Total calculated
    $176,288
    From this org
    $139,050
    From related orgs
    $0
    Other
    $37,238
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $139,050
    Bonus
    not reported
    Other
    not reported
    Deferred
    $11,124
    Nontaxable benefits
    $26,114
    Filer's total
    $176,288

  • Mary Grace Wahl

    Assoc Dir of Colle

    Total calculated
    $159,993
    From this org
    $113,810
    From related orgs
    $0
    Other
    $46,183
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $113,810
    Bonus
    not reported
    Other
    not reported
    Deferred
    $9,440
    Nontaxable benefits
    $36,743
    Filer's total
    $159,993

  • Bayard Miller

    Assoc Dir of Digit

    Total calculated
    $147,161
    From this org
    $120,120
    From related orgs
    $0
    Other
    $27,041
    Hours/week
    40

  • Linda Musumeci

    Dir of Grants & Fe

    Total calculated
    $133,218
    From this org
    $122,802
    From related orgs
    $0
    Other
    $10,416
    Hours/week
    40

  • Dr Joanna Aizenberg

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr Julia H Gaisser

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr Jacqueline K Barton

    V.P./Council

    Total calculated
    $0
    Hours/week
    1

  • Dr Dusa McDuff

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr Clyde F Barker

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr Linda K Kerber

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr Vijay Kumar

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr Jianguo Liu

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr Anne Case

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr David Skorton

    Councilor/Secy

    Total calculated
    $0
    Hours/week
    1

  • Dr Richard E Lenski

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • John S Reed

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Linda Greenhouse

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr Nina Jablonski

    V.P./Council

    Total calculated
    $0
    Hours/week
    1

  • Sir Mark Thompson

    Councilor

    Total calculated
    $0
    Hours/week
    1

  • Dr Kathleen Hall Jamieson

    Councilor

    Total calculated
    $0
    Hours/week
    1

The first 25 listed. 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. A Schedule J breakdown is as filed: base pay, bonus, other, deferred compensation and nontaxable benefits from this organization, with any from related organizations beside each, and the filer's own total. It is shown with the Part VII listing of the same name on the same return. The form gives no key between the two, so that pairing is ours, and is marked matched by us. Earlier years are each on their own filing page.

Filings

  • 2024
    Revenue
    $20,391,804
    Expenses
    $15,571,638
    Contributions
    $3,265,366
    Grants paid
    $1,754,046
  • 2023
    Revenue
    $13,318,942
    Expenses
    $14,213,316
    Contributions
    $3,852,845
    Grants paid
    $1,712,648
  • 2022
    Revenue
    $12,299,474
    Expenses
    $13,165,105
    Contributions
    $6,463,558
    Grants paid
    $1,449,021

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

  • 2024 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

  • 2023 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

  • 2022 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

  • 2021 · 990

    Revenue
    $31,170,811
    Expenses
    $11,610,685
    Assets (EOY)
    $294,142,753

  • 2021 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

  • 2020 · 990

    Revenue
    $17,828,894
    Expenses
    $11,541,667
    Assets (EOY)
    $270,283,272

  • 2020 · 990-T

    Revenue
    not reported
    Expenses
    not reported
    Assets (EOY)
    not reported

  • 2019 · 990

    Revenue
    $21,714,430
    Expenses
    $12,205,000
    Assets (EOY)
    $249,678,183

  • 2018 · 990

    Revenue
    $9,021,846
    Expenses
    $11,656,296
    Assets (EOY)
    $216,771,328

  • 2017 · 990

    Revenue
    $13,798,840
    Expenses
    $10,251,546
    Assets (EOY)
    $237,124,783

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. Showing the 10 most recent; the API carries the rest.

Grants made

Where these grants went next →

Grants received

The 10 largest by cash amount. The API serves every itemized grant.

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 9 November 2026 and read 9 November 2026, for every organization at once. Returns through tax year 2024, the newest we have parsed for this organization.