I'd like to find the people
There are so many examples we can point to and in each case the success story is driven by a single individual with the right knowledge, there at the right time and with the right attitude to share their knowledge with other people.
And most times these folks are doing it on a pure voluntary basis, or in basic pay jobs that don't reward their skills.
We need to turn society around so that teaching children is seen as an elite job for really highly skilled people, rather than a dead-end for those who can't do better in the "real world".
The way the free market works is a sort of lowest-price lowest-quality driver. Nobody seems to be able to pay for quality teaching anymore.
(which links to a bunch of threads over on offtopic etc.)