What is the author's style in Fast Food Nation by Eric Schlosser?

As an investigative journalist, Eric Schlosser has approached his research and writing with a comprehensive, well-organized journey through the fast food industry from its beginnings in southern California to its current global realization. He met and interviewed individuals from virtually every aspect of the industry—ranchers, chicken growers, potato farmers, meat-packing workers, fast food restaurant employees, small independent restaurant owners, and citizens of foreign countries into which fast food chains have expanded.