I have met and corresponded with one of the Proof School founders, Paul Zeitz, and I am very encouraged by this effort to build a school in the United States with a deep mathematics curriculum. (There are already schools with deep mathematical curricula in China and in Russia.) Zeitz is very thoughtful about mathematics education, and one of his stories has become an inspiration to my local students.[1]
[1] http://www.epsiloncamp.org/CourageandStupidity.php