Guy Gallo (1955 - 2015) was a a screenwriter, essayist, poet and playwright.
In 1979 Guy Gallo was a young undergraduate at Harvard at when he read Under the Volcano. “I picked up the New York Times Magazine survey of the favorite books of well-known writers. Under the Volcano was on everybody's list. I did two critical papers on it and later as a graduate student at Yale Drama school wrote a screenplay of it, just as an exercise.”
Fitzgerald, whose father had taught Gallo at Harvard, called him on a different project and asked for some samples of his writing. Gallo mentioned the Lowry script and sent it for inspection. Fitzgerald handed it to Huston, with the result that the veteran director and the novice script writer spent four months in Puerto Vallarta chiseling away at five or six rewrites, each version spare and more economical than the last.
Eventually there was a finished product. “I had read Lowry's letter to his agent after he and his wife died did a screenplay for Tender Is the Night,” Gallo says. “He wrote: ‘I've left out enough for a Puccini opera.’ In that case, I've left out enough for two.”
From Under the Volcano from The Times [London] [PDF]
Melinda Camber Porter in Conversation with Guy Gallo on the set of Under the Volcano, Mexico 1983 [PDF]