This is a pretty good book. While Field has been touched by beneficial timing, and influential relationships, he has developed through diligence a perspective and vision for film, screenplays in particular.
While the book begins as an autobiography: school, wanderings, discovering film, school, early work, etc., it developes into a book of analysis and technique. In that way it went from good to okay. His working at Wolper Productions, his relationship with Jean Renoir and Sam Peckinpah all are interesting views of film making and film makers. I wish there was more of that. In fact, after a half chapter plus on Citizen Kane, in a following chapter Field talks about working at Wolper on a series hosted by Joseph Cotton. But there is no regarding of Cotton's involvement in the most influential of films.
Through script reviewing at Wolper Productions he developes a style and level of efficiency which begins to translate itself into a writing career. He survives off of optioned scripts for several years before he begins teaching. From this point on he becomes more of an advisor, and leads up to his place today as a formidable screenplay expert.
Within this arc, from autobiography to technical manual there is interesting and insightful writing on film, it's brilliance, influence, form and power. A decision on whether or not to make this a technical book about writing a screenplay or a memoir about a life in the film business would have improved this book.