I basically agree with your assumptions in the article "Putting Ph.D.s at the head of the class," especially that it is difficult to recruit new Ph.D.s as K-12 teachers. I feel there is an additional supply of Ph.D.s who could be recruited far more easily for K-12 teaching, namely retirees. After more than 25 years in an industrial R&D laboratory or plant, the experience one has could be invaluable to especially high-school-level students, who are trying to figure out what to do with their lives. If a way to easily get a teaching certificate could be formulated, this would be a great thing to do in "retirement."
Keith F. Dahnke, Ph. D.
Phillips Petroleum Co.