Behind paywall, but someone at Khan Academy is an NCTM member, right? Right? If not, shoot me a note. We’ll get a copy to you.
Or from the other article:
Khan could tap into any number of existing networks of exemplary teaching, perhaps from recipients of the Presidential Award for Excellence in Mathematics and Science Teaching or the National Board of Professional Teaching Standards. He could seek these teachers’ advice and collaboration on issues large and small.
Meaning, they are not interested in contributing in any way, but they are feeling pity he did not ask for their permission before starting KA.