Sullivan & Cromwell LLP is an American multinational law firm headquartered in New York City. Founded in 1879 by Algernon Sydney Sullivan and William Nelson Cromwell, the firm advised on the creation of Edison General Electric and the formation of U.S. Steel, pioneered modern reorganization efforts for insolvent companies, and influenced key financial and regulatory practices. During the 1930s, the firm became one of the world's largest law firms and contributed to the development of shareholder derivatives, antitrust actions, federal income tax law, and securities registration.
https://en.wikipedia.org/wiki/Sullivan_%26_Cromwell