Paul Drennan Cravath was a prominent American corporate lawyer and presiding partner of the New York law firm known today as Cravath, Swaine & Moore. At the firm, he devised and implemented the Cravath System which has come to define the structure and practice of most large American firms.

A law firm is a business entity formed by one or more lawyers to engage in the practice of law. The primary service rendered by a law firm is to advise clients about their legal rights and responsibilities, and to represent clients in civil or criminal cases, business transactions, and other matters in which legal advice and other assistance are sought.