This chapter traces the foundations of emergency arbitration, from the historic opposition to, and subsequent rapid rise of, interim measures in international arbitration, of which emergency arbitration represents the pinnacle. The concept of emergency arbitration first appeared in the rules of the American Arbitration Association (AAA), and then the International Centre for Dispute Resolution (ICDR), which is the international division of the AAA. The ICDR set ambitious standards, providing for the appointment of an emergency arbitrator within one business day of receipt of the application, and for the establishment of a procedural timetable within two business days of that appointment, but otherwise not prescribing any timeframe within which the emergency arbitrator's decision must be issued. As it transpired, the ICDR Rules (2006) not only set the emergency arbitration scene, but they also clearly defined the landscape. Statistics illustrate that emergency arbitration has filled a void in international arbitration, and that it is becoming increasingly popular.