Sydney Alvin Field (December 19, 1935 – November 17, 2013) was an American author who wrote several books on screenwriting, the first being Screenplay: The Foundations of Screenwriting (Dell Publishing, 1979). He led workshops and seminars about producing salable screenplays. Hollywood film producers use Field's ideas on structure to measure the potential of screenplays. In 2001, he was inducted into American Screenwriters Association's Screenwriting Hall of Fame. Source: Wikipedia (en)