My research is on the theory of matter at very high energy density. I was one of the first to propose that high energy heavy ion collisions might make a Quark Gluon Plasma, and showed how this might happen using Bjorken's space-time picture of hadronic collisions. With Ben Svetitsky, I did the first Monte Carlo simulation of high temperature QCD and showed that there is a de-confining phase transition. With Peter Armold, I also did seminal work on baryon number violation in electroweak theory.
More recently, with Rob Pisarski, we invented the concept of Quarkyonic Matter: Matter at very high baryon density that has properties of both free quarks and confined mesons and baryons.
With Raju Venugopalan, we invented the idea of the Color Glass Condensate, the matter that controls the high energy limit of QCD.
With Alex Kovner and Heribert Weigert, we invented the ideas behind the Glasma, matter that makes the transition between the the Color Glass Condensate and the Quark Gluon Plasma in collisions of strongly interacting particles. I am now working on the properties of the Glasma, how it thermalizes and the possibility that it may form gluons Bose condensates. I also have written a number of biographical sketches of theoretical physics, and written a number of anecdotes related to my life as a physicist.