There will be a few instances, maybe many, during your time as a graduate student when you will need a letter of reference from your supervisor or another professor. For example, some scholarship applications, award nominations, grant applications, and even some job applications will require you to include a reference letter from a faculty member. Or, to nominate yourself for a position on a committee within your department or somewhere else on campus, you will often need to submit a reference letter with your application. If you are applying to a PhD program, or if you are already a PhD student and you are applying for postdoc positions or some other academic appointment, you will definitely need reference letters.
So how do you go about asking for a letter of reference? Who should you ask and how should you ask them?