I just listened to a podcast about a guy, John Corcoran, who taught for 17 years, but didn’t know how to read or write. That’s an example of a teacher who had heart, but not expertise.
http://www.johncorcoranfoundation.org/about/corcoran/
But I think that claim is subject specific. At the college level there needs to be a threshold of expertise, but what determines that level, I don’t know. That book sounds good. Teaching takes a lot of courage!
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