(1866-1936) US journalist. Born in San Francisco and educated at Berkeley, Steffens joined the staff of the New York Evening Post 1892. An expert in financial affairs, Steffens served as editor of the New York Commercial Advertiser 1897–1901 and later joined the staff of McClure’s Magazine. Intent on exposing corruption and fraud in high places, he joined forces with writers Ida Tarbell and Ray Stannard Baker and initiated the style of investigative journalism since known as “muckraking.” Steffens later covered the Mexican Revolution and befriended Lenin. His Autobiography appeared 1931.