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]
(..) It's their problem. Your answer isn't, "face the wall." It's out there... ...where you've been working. That was heavy. That Isaac Newton fellow was right. - He was onto something. - Clever boy. Don't worry, that's mine. I'll come and get it in a minute. Oh, God. (..)2001 A Beautiful Mind