Who wrote the novel that the film "Death Wish" was loosely based on?

Brian Francis Wynne Garfield (born January 26, 1939) is an American novelist and screenwriter. He wrote his first published book at the age of eighteen and wrote several novels under such pen names as "Frank Wynne" and "'Brian Wynne" before gaining prominence when his book "Hopscotch" (1975) won the 1976 Edgar Award for Best Novel. He is best known for his 1972 novel "Death Wish", which was adapted for the 1974 film of the same title, followed by four sequels, and the 2018 remake. His follow-up 1975 sequel to "Death Wish", "Death Sentence", was very loosely adapted into the 2007 film of the same name; it had an entirely different storyline, but with the novel's same look on vigilantism.

Garfield was born in New York, the son of Frances O'Brien, a portrait artist, and George Garfield. He is the nephew of chorus dancer and stage manager Chester O'Brien.