Contributor(s): Professor Eve Mitleton-Kelly, Professor Dr Paul Lukowicz, Nestor Alfonzo Santamaria | The scientists behind a crowd safety app, and the City of London Police who use the app in emergencies, will discuss the difference it can make to policy-makers and the emergency services. Eve Mitleton-Kelly is director of the Complexity Research Group at LSE and organised the trial of the app. Paul Lukowicz is scientific director at the Embedded Intelligence German Research Center for Artificial Intelligence (DFKI). Nestor Alfonzo Santamaria is the lead in business resilience for the City of London Corporation where he is part of the Security & Contingency Planning Group. The LSE Complexity Group has been working for over 16 years, with organisations in the private and public sectors, and several companies in the aerospace industry, to address practical complex problems. In the process it has developed a theory of complex social systems and an integrated methodology using both qualitative and quantitative tools and methods. LSE Works is a series of public lectures, that will showcase some of the latest research by LSE's Research Centres. In each session, LSE academics will present key research findings, demonstrating where appropriate the implications of their studies for public policy. A list of all the LSE Works lectures can be viewed online.