Professor, UNR. Professor McCallen is the Director of the Center for Civil Engineering Earthquake Research at UNR and a senior scientist at Lawrence Berkeley National Laboratory where he leads the DOE EQSIM Exascale Computing Project. His career started in the Structural and Applied Mechanics Group at Livermore where he developed computational software and performed advanced simulations on a number of structures. His responsibilities eventually extended to leadership of major programs including Engineering Division Leader for the National Ignition Facility, Nuclear Systems Program Leader and Deputy Principal Associate Director for Global Security. Most recently, Dr. McCallen held the position of Associate Vice President for National Laboratories in the University of California Office of the President.