In the beginning…
In 1966, John Philip Greenwell, Jr. (1895 – 1986) established the Greenwell Foundation, and began long-term plans for his Southern Maryland estate. John Philip Greenwell was a true visionary. Long before the Americans with Disabilities Act, when many individuals with disabilities were still institutionalized, he envisioned a place where people with disabilities could come and experience the beauty of nature and the joy of outdoor recreation, just like anyone else. To that end, he donated his property to the state of Maryland.

The park opened to the public in the mid-1990s. In 1997, the Greenwell Foundation began offering active programming with a Therapeutic Riding Program. Today, the Foundation offers a range of inclusive programs, striving to provide opportunities for all people of all abilities.

Through an innovative partnership with Maryland Department of Natural Resources, the property has been consistently upgraded to improve access to the buildings, grounds, and waterfront.