Luhmann left behind 70,000 index cards, published over 70 books and ~400 papers, and his systems theory is still actively applied in sociology, legal theory, and organizational studies. He's required reading at German universities. Your sample size of n=2 is methodologically a little thin – which Luhmann himself would have appreciated, given that he had a particular fondness for pointing out systemic blind spots.
"Two professors hadn't heard of him" is a fascinating epistemological standard. Like me stating: I've also met two cardiologists who didn't know who Rudolf Virchow was. Guess he wasn't that productive either.
"Two professors hadn't heard of him" is a fascinating epistemological standard. Like me stating: I've also met two cardiologists who didn't know who Rudolf Virchow was. Guess he wasn't that productive either.