Fiscal year ending 2024. Filed on October 23, 2025.
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 2024 IRS Form 990 filing, Gustavus and Louise Pfeiffer Research Foundation, a 501(c)(3) charitable organization, reported compensation for 5 employees. Among the employees shown here, the average compensation is $6,800. The highest compensated employee at Gustavus and Louise Pfeiffer Research Foundation is Patricia R Herold with fiscal year 2024 compensation of $7,200.
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Employee compensation
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