- Draft Master Plan and EIS: Clarence Fahnestock and Hudson Highlands State Parks
- Hudson Hills & Highlands Environmental Leaders Learning Alliance (ELLA)
- Teatown Lake Reserrvation
- Westchester Mountain Bike Association
- Hudson Highlanders MTB
- Fats in the Cats Bicycle Club
- Beacon Institute for Rivers and Estuaries
- Clarence Fahnestock State Park
- Hudson Highlands State Park
- NY-NJ Trail Conference
- Audubon - Important Bird Areas
- eBird (Cornell and Audubon)
- Taconic Outdoor Education Center
- Scenic Hudson
- Riverkeeper
- Open Space Institute
- Glynwood
- Other friends of parks groups
- Palisades Park Conservancy
- Friends of the Rockefeller State Park Preserve, Inc
- Friends of Grafton Lakes State Park
- Friends of Van Cortlandt Park
- The Caumsett Foundation
- Friends of Morningside Park
- Friends of Westchester County Parks
- Friends of Barker Park
- Friends of the Old Croton Aqueduct
- Prospect Park Alliance