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Many PhD's would probably teach high school, except for the ridiculous credentialing programs / teacher licensing requirements. Basically you have to get a 1.5 year education degree to "qualify" to teach a subject; yes, you can have a PhD in math from Princeton and be unqualified to teach 9th grade math in Trenton. Makes me want to vomit.

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In terms of math skills, sure. But a senior in high school should have enough mastery of the material to explain things to a 9th grader, so that's a bad argument. As anyone who's taken an undergraduate class in the hard sciences knows, a PhD does not indicate anything about teaching ability (in my experience, it's anti-correlated with it if anything).

I'm sure the credentialing process has its own unique failings, but it is trying to act as a real value add.

It is trying to act as a value add, but it failing consistently and pointlessly. The data, I think, are in. It is a waste of time and limits the number of possible good teachers.

I wanted to teach high school at one point but couldn't. I was an adjunct lecturer at a college.

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