I understand that a hotelier is "someone who owns or manages a hotel" (reference), much like a hotelkeeper (reference). However, these functions (owning and managing) are far too specific, the same way a concierge, a receptionist and a hotel desk clerk are.
I have also seen a few references to the word hotelry used as an adjective meaning "things that are related to hotels", but there doesn't seem to be any such entry in dictionaries.
Thus my questions are:
Is there a word in English to refer to "people that work in hotels"?
Is there a word to refer to "things that are related to the realm of hotels"?