Founding
Schools

The Blake School / Minneapolis, MN
The Buckley School  /  Sherman Oaks, CA
Catlin Gabel School  /  Portland, OR
Choate Rosemary Hall / Wallingford, CT
Hawken School  /  Gates Mills, OH
Indian Springs School / Indian Springs, AL
The Island School  /  Eleuthera, Bahamas
Latin School of Chicago / Chicago, IL
Marin Academy / San Rafael, CA


Mounds Park Academy / Saint Paul, MN
The Nueva School
/ San Mateo, CA
Punahou School / Honolulu, HI
Riverdale Country School  /  Bronx, NY
Sage Hill School  /  Newport Coast, CA
San Francisco University High School  /  San Francisco, CA
The Spence School  /  New York, NY
Tilton School  /  Tilton, NH
Wildwood School / Los Angeles, CA

Member
Schools

Allen Academy / Bryan, TX
The Altamont SchoolSouth Birmingham, LA
 American International School Riyadh / Riyadh, Saudia Arabia
American International School Chennai
  / Chennai, India
American School of Bombay / Bombay, India
American School of Dubai
/ Dubai, United Arab Emirates
Asheville School
/ Asheville, NC
The Athenian School
  /  Danville, CA
The Bay School of San Francisco  /  San Francisco CA
Bentley School / Oakland, CA
The Berkeley Carroll School / Brooklyn, NY
The Branson School  /  Ross, CA
Brooks School / North Andover, MA
Brookstone School / Columbus, GA
Brunswick School / Greenwich, CT
The Bush School  /  Seattle, WA
Campbell Hall / Milton, MA
Cannon School  /  Concord, NC
Carrollwood Day School / Tampa, FL
Cary Academy / Cary, NC
Cascades Academy  /  Bend, OR
Castilleja School / Palo Alto, CA
Chadwick School  /  Palos Verdes Peninsula, CA
Chadwick International  /  Incheon, South Korea
Chapel Hill-Chauncy Hall School  / Waltham, MA
The Chapin School / New York, NY
Charles Wright Academy / Tacoma, WA
Christchurch School / Christchurch, VA
Christian Brothers College High School / St. Louis, MO
The College Preparatory School  /  Oakland, CA
Colorado Academy  /  Denver, CO
/ Shanghai, China
Cranbrook Schools  /  Bloomfield Hills, MI
Crystal Springs Uplands School  /  Hillsborough, CA
The Dalton School / New York, NY
Delphian School / Sheridan, OR
Drew School / San Francisco, CA
Ensworth School / Nashville, TN
Episcopal High School / Alexandria, VA
Flintridge Preparatory School / La Cañada Flintridge, CA
The Galloway School / Atlanta, GA
Gann Academy / Waltham, MA
The Geneva School / Winter Park, FL
Gilman School / Baltimore, MD
Global Online Academy  /  Seattle, WA
Graded – The American School of Sao Paulo / Sao Paulo, Brazil
Grand River Academy / Austinburg, OH
The Grauer School / Encintas, CA
Greens Farms Academy  /  Westport, CT
Greenwood College School / Toronto, Canada
Harpeth Hall / Nashville, TN
Head-Royce School  /  Oakland, CA
The Hewitt School / New York, NY
The Hill School / Pottstown, PA
The Hockaday School / Dallas, TX
Holderness School  /  Plymouth, NH
Holton-Arms School / Bethesda, MD
The Independent School of Winchester, Inc. / Winchester, VA
Island Pacific Academy / Kapolei, HI
Journeys School of Teton Science Schools / Jackson, WY
Kamehameha School Maui / Pukalani, HI
Khan Lab School
/ Mountain View, CA

King’s Academy  /  Madaba-Manja, Jordan
Laguna Blanca School
/ Santa Barbara, CA
Lake Forest Academy
/
Lake Forest, IL
Lake School /
Bangkok, Thailand
Lakeside School 
 /  Seattle, WA
Laurel School
  /  Shaker Heights, OH
Lawrence School
  /  Sagamore Hills, OH
Lincoln School Nepal
/ Kathmandu, Nepal
The Lovett School
/ Atlanta, GA
Malvern Preparatory School
 Malvern, PA
Maumee Valley Country Day School / Toledo, OH
The Masters School
  /  Dobbs Ferry, NY
Menlo School
/ Atherton, CA
The Miami Valley School
/ Dayton, OH
Mid-Pacific Institute
/
Honolulu, HI
Midland School
/  Los Olivos, CA
Milton Academy  /  
Milton, MA
Miss Porter’s School
/ Farmington, CT
Mount Vernon Presbyterian School  /  Atlanta, GA
NGL Academy / Santa Rosa, CA
NGL Academy / Bellevue, NE
Newton Country Day School of the Sacred Heart  / Newton, MA
Noble and Greenough School  /  Dedham, MA
North Shore Country Day School  /  Winnetka, IL
Northfield Mount Hermon School / Mount Herman, MA
The Northwest School / Seattle, WA
The Ocean School / Los Angeles, CA
One Schoolhouse / Bethesda, MD
Oregon Episcopal School   /  Portland, OR
Parish Episcopal School / Dallas, TX
Park Tudor School / Indianapolis, IN
Phillips Academy  /  Andover, MA
Phillips Exeter Academy / Exeter, NH
Phoenix Country Day School / Paradise Valley, AZ
Pingree School  / Hamilton, MA
Pius XI High School / Milwaukee, WI
Polytechnic School  /  Pasadena, CA
Pomfret School  /  Pomfret Center, CT
Portledge School / Locust Valley, NY
The Principia / St. Louis, MO
Putney School  /  Putney, VT
Rowland Hall / Salt Lake City, UT
Rutgers Preparatory School / Somerset, NJ
San Domenico School  /  San Anselmo, CA
Singapore American School / Singapore
St. Francis Episcopal School  /  Houston, TX
St. George’s Independent School  /  Memphis, TN
St. John’s School  /  Houston, TX
St. Luke’s School  /  New Canaan, CT
The Stone Independent School  /  Lancaster, PA
Stuart Hall School /  Staunton, VA
Tahoe Expedition Academy  /  Kings Beach, CA
The Thacher School / Ojai, CA
Thaden School / Bentonville, AR
University High School of Indiana / Carmel, IN
University Preparatory Academy  /  Seattle, WA
University School of Nashville  /  Nashville, TN
Urban School of San Francisco  /  San Francisco, CA
Watershed School  /  Boulder, CO
Westridge School / Pasadena, CA
Westtown School  /  West Chester, PA
Windward School / Los Angeles, CA
Winsor School / Boston, MA
Woodlawn School / Mooresville, NC
Wooster School / Danbury, CT
Woodside Priory School / Portola Valley, CA