Gyffled was a professor in the 24th century, who once taught Carol Abramowitz. The Prime Directive was one of the topics covered in Gyffled's course, in which Abramowitz received a good grade. (SCE eBook: Fables of the Prime Directive) It is not stated where Gyffled was an instructor, though it may have been at Cambridge University, where Abramowitz did her early studies.