Who employs a documentary-style, hand-held, cinéma vérité technique, blending naturalistic and photo-realistic computer-generated effects, Don Chaffey or Neill Blomkamp? 
Don Chaffey: Donald Chaffey (5 August 1917 – 13 November 1990) was a British film director, writer, producer, and art director. Neill Blomkamp: Neill Blomkamp (] ; born 17 September 1979) is a South African film director, film producer, screenwriter, and animator. Neill Blomkamp:  Blomkamp employs a documentary-style, hand-held, cinéma vérité technique, blending naturalistic and photo-realistic computer-generated effects.
Neill Blomkamp