> In 1955, he was promoted to tenured associate professor. In December 1957, Asimov was dismissed from his teaching post, with effect from June 30, 1958, due to his lack of research.

I thought the whole point of getting tenure is that you can't get fired.

Yes that’s true, but I was referring to the line where it said he was making more money as a writer, which was before he became a tenured professor. In any case, we’re both addressing the point that he did have an academic career aside from writing.