The increasing importance of international investment has been accompanied by the rapid development of a new field of international law that defines the obligations of host states towards foreign investors and creates procedures for resolving disputes in connection with those obligations. "Investor-State Arbitration" examines the international treaties that give investors a right to arbitration of claims, the most commonly employed arbitration rules, and the most important elements of investor-state arbitration procedure, including tribunal composition, jurisdiction, evidence, award, and challenge of annulment. Expert coverage includes procedural barriers to recovery, analysis of the substantive law of investment protection, and analysis of recent investor-state arbitral jurisprudence.