a teaching/research 'fellow' [=a graduate student who gets money in exchange for teaching/research]
He attended the concert with a 'fellow' student. [=someone who is a student, as he is]
He has always tried to be of service to 'his fellow man'. [=to other people]
(..) who aren't, do not be alarmed. What you're about to see is considered safe. - And who are you? - I am a humble admirer and a fellow practitioner. Mmm. Very good. - Another one? - Oh, if you insist. - Another. - I'm not performing tonight. (..)2006 The Prestige