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Compensation 990 is an independent service that uses public IRS Form 990 filings as its source data. We clean and standardize this information, but the original filings may contain errors or omissions. Years on this site refer to the organization’s fiscal year end date on the filing.

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Organizations Gustavus and Louise Pfeiffer Research Foundation

Gustavus and Louise Pfeiffer Research Foundation

Fiscal year ending 2021. Filed on November 16, 2022.

Foundation Source 501 Silverside Rd
Wilmington, Delaware 19809

Gustavus and Louise Pfeiffer Research Foundation (EIN: 13-6086299) has filed an IRS Form 990 since fiscal year 2020. In its fiscal year 2021 IRS Form 990 filing, Gustavus and Louise Pfeiffer Research Foundation, a 501(c)(3) charitable organization, reported compensation for 7 employees. Among the employees shown here, the average compensation is $5,400. The highest compensated employee at Gustavus and Louise Pfeiffer Research Foundation is Matthew Mayro Keeney with fiscal year 2021 compensation of $5,400.

Revenue, expenses, and employee compensation

Revenue

$3,508,351

Expenses

$4,671,757

Employee compensation

—
Revenue, expenses, and employee compensation over time

Reported Compensated Employees

Matthew Mayro Keeney
Vice President and Director
$5,400
$5,400 No related compNo other comp
H Robert Herold II
Director
$5,400
$5,400 No related compNo other comp
Sarah Sp McCarthy
Director, Asst Sec, Asst Treas
$5,400
$5,400 No related compNo other comp
Lise P Chapman
President and Director
$5,400
$5,400 No related compNo other comp
Patricia R Herold
Treasurer and Secretary and Director
$5,400
$5,400 No related compNo other comp
Matthew G Herold Jr
Director, Honorary Chair
$5,400
$5,400 No related compNo other comp
Kimberly Herold Alvarez
Director
$5,400
$5,400 No related compNo other comp

Benchmark Employee Compensation

Revisions to this organization profile

October 23, 2025:
2024 Gustavus and Louise Pfeiffer Research Foundation 990 filed
November 14, 2024:
2023 Gustavus and Louise Pfeiffer Research Foundation 990 filed
November 8, 2023:
2022 Gustavus and Louise Pfeiffer Research Foundation 990 filed

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