Encyclopaedia Britannica's editors oversee subject matter parts where they may have considerable expertise, irrespective of whether from yrs of practical experience received by working on that content material or by means of examine for an advanced diploma. They compose new content material and validate and edit articles obtained from contributors. https://www.whofish.org/Default.aspx?tabid=45&modid=379&action=detail&itemid=284671&rCode=33