What is the introduction to Jack London’s life?

Jack London (1876~1916), American writer. Born in San Francisco, California, his family was poor and had always lived in poverty. He himself once wrote: "From the time I was 9 years old, except for the years I spent in school (even schooling was paid for with the income from my hard work), life was very difficult, and none of them had a serious career. It’s heavy physical labor.” He worked as a newsboy, a worker, a sailor, an oyster thief, a homeless man, and even joined the gold rush in Alaska. He had no formal education in his life, but he loved reading, and besides earning money to support his family, he spent most of his time reading. In 1900, his first collection of short stories, "The Wolf's Son", was published and received widespread critical acclaim. He was so familiar with the life of adventure, sailing, travel, and exploration that his best works are all stories of this kind: "The Call of the Wild" (1903), "Sea Wolf" (1904), "White House" Teeth" (1906), "Love of Life" (1906), the semi-autobiographical novel "Martin Eden" and the autobiographical novel "John Ballycorn" (1913). Jack London was also enthusiastic about the labor movement and social activities, and published the social feature "People in the Abyss" (1903), the essay collection "Class War" (1905), the political fantasy novel "The Iron Heel" (1908), etc.