Kirkland & Ellis LLP is an American law firm. Founded in 1909 in Chicago, Illinois, Kirkland & Ellis is the largest law firm in the world by revenue, the seventh-largest by number of attorneys, and is the first law firm in the world to reach US$4 billion in revenue. As of 2021, Kirkland & Ellis ranks third on Am Law's list of profits per equity partner. While Kirkland & Ellis was historically considered a firm focused on litigation, during the 2010s, it expanded private equity and restructuring practices which, together with large-scale commercial litigation, comprise the core legal service areas of the firm. Many attorneys from the firm have served as federal officials or judges, including United States Supreme Court Justice Brett Kavanaugh and former Attorney General William Barr.