# Open Space Institute

Open Space Institute is an Endowment based in New York, United States.

## Overview

- **Organization type:** Endowment
- **Headquarters:** New York, United States
- **Region:** North America
- **Address:** New York, New York, United States
- **Founded:** 1974
- **Assets under management:** 194 (Altss estimate)
- **Website:** openspaceinstitute.org
- **LinkedIn:** https://www.linkedin.com/company/open-space-institute

## Regulatory record

- **Reports private funds:** No

## About

The Open Space Institute was founded in 1974 by John H. Adams and others to conserve land in the eastern United States. Erik Kulleseid assumed the role of President and CEO in 2024 after serving as New York State Parks Commissioner, succeeding Christopher J. Elliman. OSI deploys its resources through land acquisition, conservation easements, and grantmaking. Asset classes include fee-simple purchases, easement portfolios, and funding vehicles such as the Appalachian Landscapes Protection Fund and the Resilient Landscapes Initiative. The group operates in New York, South Carolina, Georgia, and Florida. Confirmed partners include The Nature Conservancy on the Finch Pruyn project and the Wyss Foundation on the Eastern Lands Initiative. The organization maintains an estimated $194 million in assets and employs staff across its New York headquarters. It holds additional properties including the Blue Hill Property and Watson Hollow in the Catskills. In April 2024 Erik Kulleseid became President and CEO. OSI belongs to the Land Trust Alliance as an accredited member. OSI differs from typical endowments because it executes its own acquisitions and immediately conveys many parcels to public agencies rather than retaining them in a perpetual investment portfolio. Governance centers on a board that includes long-serving trustees such as Samuel G. Waterston.

## Sectors

- Real Estate

## People

- Erik Kulleseid — President and CEO

## Questions

### Who runs investment decisions at Open Space Institute?

Erik Kulleseid serves as President and CEO and oversees capital allocation for land purchases and grants. The board, including John H. Adams as founding chair, sets strategic direction.

### How does Open Space Institute source land acquisitions?

OSI identifies parcels through direct outreach, state agency coordination, and partnerships with groups such as The Nature Conservancy and the South Carolina Conservation Bank.

### Does Open Space Institute participate in fund commitments or only direct deals?

OSI executes direct land purchases and issues project-specific grants. It does not commit capital to external funds.

### What investment stages does Open Space Institute typically target?

The organization focuses on fee-simple acquisitions and conservation easements that deliver immediate protection rather than staged venture or private-equity deployments.

### Where does the underlying capital come from?

Funding originates from philanthropic grants, including support from the Wyss Foundation, Doris Duke Charitable Foundation, and Bloomberg Philanthropies.

### How is Open Space Institute related to its land trust vehicle?

Open Space Institute Land Trust Inc. holds title to certain properties and works alongside the main entity to complete acquisitions and transfers.

### What is Open Space Institute's known posture on co-investments alongside external partners?

OSI frequently structures joint projects with state agencies and other foundations, transferring completed holdings to entities such as the New York State Department of Environmental Conservation.

## Related profiles

- [Mennonite Education Agency](https://altss.com/profile/mennonite-education-agency-mea)
- [Aoi Pro.](https://altss.com/profile/aoi-pro)

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

Canonical page: https://altss.com/profile/open-space-institute

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