He is hired to train people to speak properly.
(The last answer)
Hope this helps :)
Herr was a war correspondent who is famous for "Dispatches" - a Vietnam war memoir. Philip Caputo wrote a book "A Rumor of War", also about Vietnam war. Both became very important "documents" of the war, even a dispute arised on the discussion of best book written for the Vietnam war. The crucial difference is that Herr's book is consisted of pure personal experience, while some parts of Caputo's book contain fiction.
Born on November 13, 1850, in Edinburgh, Scotland, Robert Louis Stevenson traveled often, and his global wanderings lent themselves well to his brand of fiction. Stevenson developed a desire to write early in life, having no interest in the family business of lighthouse engineering.