Neil Johnson heads up a new inter-disciplinary research group in Complexity at University of Miami (Physics Dept.) looking at collective behavior and emergent properties in a wide range of real-world Complex Systems: from physical, biological and medical domains through to social and financial domains. The common feature which makes Complex Systems so hard to understand, and yet so fascinating to study, is that they all contain many interacting objects, with strong feedback from both inside and outside the system, and are typically far from equilibrium and exhibit extreme behavior. In 2013 Neil published a report called: "Abrupt rise of new machine technology beyond human response time". It is a study on the nano second world of trading and a must read for everyone involved, especially regulators and risk managers. The study is found in PDF below. You can also check out this article from the author.