# Greentree Foundation

Greentree Foundation is an Endowment / Foundation based in Manhasset, United States.

## Overview

- **Organization type:** Endowment / Foundation
- **Headquarters:** Manhasset, United States
- **Region:** North America
- **Address:** 220 Community Drive, Manhasset, NY 11030, United States
- **Founded:** 1982
- **Assets under management:** 335 (Altss estimate)
- **Website:** gtftew.org
- **LinkedIn:** https://www.linkedin.com/company/greentree-foundation

## Regulatory record

- **Reports private funds:** No

## About

The Greentree Foundation was established in 1982 by Betsey Cushing Roosevelt Whitney. Its operations center on the Payne Whitney Estate, a 400-acre property used for conferences on peace and human rights. The foundation allocates a portion of assets to private equity. Confirmed holdings include a diversified financial services portfolio held through a limited partnership structure. Geographic activity centers on the United States with global conference reach. The estate includes an arboretum developed for environmental sustainability. No additional offices or professional headcount figures appear in available records. A 2004 Sotheby's auction of 34 artworks generated endowment proceeds. The foundation maintains a direct relationship with the Whitney family as founder and with the United Nations for hosted retreats.

## Sectors

- Philanthropy

## People

- Betsey Cushing Roosevelt Whitney — Founder

## Questions

### Who founded the Greentree Foundation?

Betsey Cushing Roosevelt Whitney established the foundation in 1982.

### What is the primary use of the Greentree estate?

The 400-acre property operates as a conference center for international justice, human rights, and peace negotiations.

### Does the foundation maintain an art collection?

Six major paintings from the Whitney collection remain on loan to museums including the Frick Collection.

### What educational programs does the foundation run?

It hosts the Teachers' Ecology Workshop with lectures and field programs on Long Island ecology.

### Where does the foundation's endowment originate?

The endowment traces to Whitney family wealth from finance and investments, supplemented by a 2004 art auction.

## Related profiles

- [Youngstown State University Foundation](https://altss.com/profile/youngstown-state-university-foundation-ysuf)
- [SEPREV](https://altss.com/profile/seprev)

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

Canonical page: https://altss.com/profile/greentree-foundation

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