Appointees
Whatever the level of examination, it is normal to appoint as externals senior academics of acknowledged expertise - though in the case of PhD exams, expertise takes priority over seniority if the two criteria cannot both be met, as is often the case with highly specialised subjects. An invitation to serve as an external examiner is therefore usually seen as something of an honour, though often an inconvenient one: although a fee is paid to external examiners, it is usually small, and a considerable amount of work is involved, often at the busiest time of the academic year.
While the external examiner in the form described here (and the use of the title "External examiner") is specific to British or British-influenced higher education, the use of examiners from other universities (and often other countries) is widespread in other countries, especially for PhD examinations.
Read more about this topic: External Examiner