Individuals and Corporations
  • Abacoa Development Company – West Palm Beach, FL
  • Sen. Lamar Alexander – Nashville, TN
  • Allegheny Power - Greenburg, PA
  • Barrow Family – Savannah, GA
  • Bessemer Trust – New York, NY
  • Blackberry Farm Inn & Resort – Walland, TN
  • Butler Trust – Boston, MA
  • Close Family Real Estate Trust – Fort Mill, SC
  • Currituck Shooting Club – Winston-Salem, NC
  • Agnes Gund – New York, NY
  • Hershey Trust Company – Hershey, PA
  • Mrs. Arthur A. Houghton – Wye Mills, MD
  • Jasper Johns - Sharon, CT
  • Keswick Management (Dillon Family) – New York, NY
  • Loring, Wolcott & Coolidge – Boston, MA
  • Cordelia Scaife May – Pittsburgh, PA
  • McCullough Estate – Bennington, VT
  • Meach Cove Associates (Bostwick Farm) – Shelburne, VT
  • Medway Plantation – Mt. Holly, SC
  • Estate of Constance B. Mellon – Pittsburgh, PA
  • Molokai Properties Ltd. – Molokai, HI
  • Mortimer Family – New York, NY
  • Okeetee Club – Jasper Co., SC
  • Mr. and Mrs. Howard Phipps – Westbury, NY
  • Puu O Hoku Ranch – Molokai, HI
  • Robert Redford – Sundance, UT
  • David Rockefeller – New York, NY
  • Laurance S. Rockefeller – New York, NY
  • Nelson A. Rockefeller, Jr. – Pocantico Hills, NY
  • South Fork Lodge - Swan Valley, ID
  • The St. Joe Company – Jacksonville, FL
  • The Sundance Group – Provo, UT
  • Tejon Ranch Company – Lebec, CA
  • Woodstock Inn & Resort – Woodstock, VT
Organizations, Foundations and Agencies
  • American Farmland Trust – Washington, DC
  • Brown University – Providence, RI
  • Callaway Gardens – Pine Mountain, GA
  • Conservation Trust of Puerto Rico – San Juan, PR
  • Colonial Williamsburg Foundation – Williamsburg, VA
  • Demeter Fund – Middlebury, VT
  • Doris Duke Charitable Foundation – New York, NY
  • Hagley Museum – Wilmington, DE
  • Hampshire College – Amherst, MA
  • Historic Hudson Valley – Tarrytown, NY
  • Institute for Ecosystem Studies – Millbrook, NY
  • Jackson Hole Preserve, Inc. – New York, NY
  • John D. & Catherine T. MacArthur Foundation – Chicago, IL; Palm Beach, FL
  • The MacDowell Colony – Peterborough, NH
  • Nantucket Conservation Foundation – Nantucket, MA
  • National Park Foundation – Washington, DC
  • National Trust for Historic Preservation – Washington, DC
  • Natural Resources Defense Council – New York, NY
  • Old Westbury Gardens – Westbury, NY
  • Open Space Institute – New York, NY
  • David and Lucile Packard Foundation – Los Altos, CA
  • Theodore Roosevelt Presidential Library Foundation – Medora, ND
  • Shelburne Museum – Shelburne, VT
  • Stone Barns Restoration Corporation – Tarrytown, NY
  • Storm King Art Center – Cornwall, NY
  • Vermont Agency of Environmental Conservation – Montpelier, VT
  • Lila & DeWitt Wallace Fund – New York, NY
  • University of West Virginia - Morgantown, WV
  • Walton Family Foundation – Bentonville, AR
  • Winrock International – Little Rock, AR
  • Winterthur (Henry F. du Pont Estate) – Wilmington, DE
  • Woodlawn Trustees, Inc. - Wilmington, DE
  • Wormsloe Foundation – Savannah, GA