William Sydney Porter, also known by his pen name O. Henry, was an American author who gained fame for his short stories with surprise endings. Some synonyms for William Sydney Porter may include: O. Henry, The Gift of the Magi author, American writer, and master of the short story. Throughout his prolific career, Porter wrote hundreds of stories that have since become classics. His use of humor, irony, and unexpected twists has influenced generations of writers. Although he passed away in 1910, William Sydney Porter's legacy lives on through his enduring literary contributions.