John Griffith "Jack" London (born John Griffith Chaney, January 12, 1876—November 22, 1916) was an American author, journalist, and social activist. He was a pioneer in the then-burgeoning world of commercial magazine fiction and was one of the first fiction writers to obtain worldwide celebrity and a large fortune from his fiction alone. He is best remembered as the author of The Call of the Wild and White Fang, both set in the Klondike Gold Rush, as well as the short stories To Build a Fire, An Odyssey of the North, and Love of Life. He also wrote of the South Pacific in such stories as The Pearls of Parlay and The Heathen, and of the San Francisco Bay area in The Sea Wolf . London was a passionate advocate of unionization, socialism, and the rights of workers and wrote several powerful works dealing with these topics such as his dystopian novel, The Iron Heel and his non-fiction exposé, The People of the Abyss.

Western writer and historian Dale L. Walker writes:

London's true métier was the short story ... London's true genius lay in the short form, 7,500 words and under, where the flood of images in his teeming brain and the innate power of his narrative gift were at once constrained and freed. His stories that run longer than the magic 7,500 generally—but certainly not always—could have benefited from self-editing.