The author of the novel 'Flowers for Algernon' is Daniel Keyes. Keyes was an American writer who wrote short stories and novels, and is best known for his science fiction works. He wrote 'Flowers for Algernon' in 1959, which was later adapted into a movie and a play. The novel follows the story of a mentally disabled man who undergoes an experimental procedure to increase his intelligence. It has become a classic of science fiction literature and has been translated into many languages.