Some people are paid by CERN to work there and are CERN employees. Other scientists are paid by their own universities, like U. Manchester in the case of B. Cox case, and go there once in a while to work. This is the case of more than 10.000 people actually.

Stating "B. Cox of CERN" instead of "B. Cox of U. Manchester" is not super nice for U. Manchester, if you see what I mean... ;)

PS: xxx from institute yyy is a usual way to talk.