Ernest Hemingway was an American writer and journalist. He is considered one of the most influential writers of the 20th century. Hemingway's writing style was influenced by the rules he learned at St. Paul's School, a private school in Concord, New Hampshire. The school's rules emphasized clarity, brevity, and directness in writing. These rules had a profound impact on Hemingway's writing style, which is characterized by its simplicity, clarity, and power.