Keith Schacht is the cofounder of Mystery Science, which makes lessons that inspire kids to love science. They were part of the Summer 2017 YC batch.
Avichal Garg is an Expert at YC and prior to that he was the Director of Product Management at Facebook.
Geoff Ralston is a Partner at YC and before that he cofounded Imagine K12, an edtech accelerator that’s now makes up YC’s edtech vertical.