pbarn, I was offline this weekend, but in case you’re listening:
it’s one of dozens of Quaker (Friends) schools in the USA; it happens to be in NYC. The Quaker sect believed so much in equality, including respecting the (nascent) wisdom of kids, that it abolished clergy and voting so no one gets overruled by sheer force or numbers. That’s why Susan B. Anthony’s father made her learn all the same subjects as the boys before 1810 … and why Quakers founded Swarthmore in the 19th century as coed.
Friends Council on Education promotes variations on how the philosophy has been carried out; that’s as close to a national model as Quakers get. After all, the USA has less than 50,000 Quakers, even though their educational and other works have long been outsized.