# Thomas L. Kempner, Jr. Foundation

Thomas L. Kempner, Jr. Foundation is an Endowment / Foundation based in Southampton, United States.

## Overview

- **Organization type:** Endowment / Foundation
- **Headquarters:** Southampton, United States
- **Region:** North America
- **Address:** 26 Hill St # 340, Southampton, NY, United States
- **Founded:** 1987
- **Assets under management:** 306 (Altss estimate)
- **Website:** guidestar.org

## Regulatory record

- **Reports private funds:** No

## About

Thomas L. Kempner Jr. created the foundation in 1987 after building his career in investment management. The entity operates from Southampton, New York, and lists family members in director and officer roles. Grant activity centers on education, health systems, and conservation. Confirmed recipients include Yale University, Harvard Business School, Mount Sinai Health System, Central Park Conservancy, and the Wildlife Conservation Society. The foundation also holds public market positions through Keewaydin Investments LLC, including Vanguard FTSE Developed Markets ETF, Vanguard S&P 500 ETF, and iShares MSCI Japan ETF. Geographic focus remains the United States with additional exposure noted in agriculture, infrastructure, and private debt. Assets under management stand at $306 million. The foundation lists five service providers including EisnerAmper LLP as auditor and Pavilion Advisory Group Ltd as investment advisor. Thomas Kempner serves as board chair of the Central Park Conservancy. In November 2025 the foundation sponsored the Central Park Conservancy Annual Gala. The foundation maintains a 100 percent ownership stake in Keewaydin Investments LLC, which holds the public equity positions. Governance rests with family directors and integrates with the founder's prior role at Davidson Kempner Capital Management.

## Sectors

- Education
- Environment
- Performing Arts

## People

- Thomas L. Kempner Jr. — Founder
- Katheryn C. Patterson — Vice President/Secretary
- Trevor Kempner — Director
- Thomas N. Kempner — Director
- Jessica S. Kempner — Director

## Questions

### Who runs investment decisions at Thomas L. Kempner, Jr. Foundation?

Thomas L. Kempner Jr. founded the entity. Family directors including Katheryn C. Patterson, Trevor Kempner, Thomas N. Kempner, and Jessica S. Kempner serve on the board. Pavilion Advisory Group Ltd acts as external investment advisor.

### Does the foundation participate in fund commitments or only direct deals?

The foundation holds public equity ETFs and maintains a residential property. It does not disclose commitments to external funds.

### What investment stages does the foundation typically target?

The foundation focuses on grant-making rather than staged venture or private equity investments. Its public holdings consist of broad market ETFs.

### How is the foundation related to Davidson Kempner Capital Management?

Thomas L. Kempner Jr. founded Davidson Kempner. Anthony Yoseloff is noted as successor and co-leader at the firm.

## Related profiles

- [The John R. Oishei Foundation](https://altss.com/profile/the-john-r-oishei-foundation)
- [Unity Health System](https://altss.com/profile/unity-health-system)

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Last updated: 2026-06-03T20:00:00.000Z

Canonical page: https://altss.com/profile/thomas-l-kempner-jr-foundation

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