Well he's only a student so somewhere between $30k and $40k, maybe a touch more if he gets a fellowship. Also, how much professors make varies quite a bit. An

Well he's only a student so somewhere between $30k and $40k, maybe a touch more if he gets a fellowship. Also, how much professors make varies quite a bit. An engineering professor might make $100k from the university. If they are particularly motivated, you have professors who write books, play key roles at companies, consult, or give expert testimony. They can make quite a bit off those secondary activities but it isn't automatic.