About retired engineers teaching math.
My husband, an electrical engineer, showed me this article ones. It was by the retired CEO or another O of Lockheed. The guy did have original degree in engineering. He is or was a presidential advisor etc, etc. He wanted to give something back to the community and asked to be a part time math teacher at his local school. He was told he lacked credentials (certification?)
Princton took him instead as a guest lecturer...