Hiram Warren Johnson was an American attorney and politician who served as the 23rd governor of California from 1911 to 1917. Johnson achieved national prominence in the early 20th century. He was elected in 1916 by the state legislature as the United States Senator from California, where he was repeatedly re-elected and served until 1945.
As a governor, Johnson was a leading American progressive. He ran for vice president on Theodore Roosevelt's Progressive ticket in the 1912 presidential election. As a US senator, Johnson became a leading liberal isolationist, among those "Irreconcilables" who opposed the Treaty of Versailles and rejected the League of Nations. Later, Johnson was also a vocal opponent of the United Nations Charter.
After having worked as a stenographer and reporter, Johnson embarked on a legal career. He began his practice in his hometown of Sacramento, California. After he moved to San Francisco, he worked as an assistant district attorney. Gaining statewide renown for his prosecutions of public corruption, Johnson won the 1910 California gubernatorial election with the backing of the Lincoln–Roosevelt League.