John Griffith Jack London (born John Griffith Chaney, January 12, 1876 - November 22, 1916) was an American author, journalist, and social activist. A pioneer in the then-burgeoning world of commercial magazine fiction, he was one of the first fiction writers to obtain worldwide celebrity and a large fortune from his fiction alone. Some of his most famous works include 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 part of the radical literary group, The Crowd, in San Francisco, and a passionate advocate of unionization, socialism, and the rights of workers. He wrote several powerful works dealing with these topics, such as his dystopian novel The Iron Heel, his non-fiction exposé The People of the Abyss, and The War of the Classes. Jack London's mother, Flora Wellman, was the fifth and youngest child of Pennsylvania Canal builder Marshall Wellman and his first wife, Eleanor Garrett Jones. Marshall Wellman was descended from Thomas Wellman, an early Puritan settler in the Massachusetts Bay Colony.

[7] Flora left Ohio and moved to the Pacific coast when her father remarried after her mother died. In San Francisco, Flora worked as a music teacher and spiritualist, claiming to channel the spirit of a Sauk chief Black Hawk.[8] Biographer Clarice Stasz and others believe London's father was astrologer William Chaney.[9] Flora Wellman was living with Chaney in San Francisco when she became pregnant. Whether Wellman and Chaney were legally married is unknown. Most San Francisco civil records were destroyed by the extensive fires that followed the 1906 earthquake; nobody knows what name appeared on her son's birth certificate. Stasz notes that in his memoirs, Chaney refers to London's mother Flora Wellman as having been his wife; he also cites an advertisement in which Flora called herself Florence Wellman Chaney.