Dr. Paul Messina is the Director of Argonne's Computational Science Division and Argonne Distinguished Fellow. During 2015-2017, he served as Project Director for the U.S. Department of Energy Exascale Computing Project. From 2008-2015, he served as Director of Science for the Argonne Leadership Computing Facility. In 2002-2004, he held the position of Senior Computer Scientist at Argonne and served as Adviser to the Director General at CERN (European Organization for Nuclear Research). At Argonne, he held a number of positions from 1973-1987 and was the founding Director of the Mathematics and Computer Science Division.
Dr. Timothy Williams is the Deputy Director of Argonne's Computational Science Division. During 2016-2018, Tim served as Deputy Director of Science for the Argonne Leadership Computing Facility (ALCF), for which he still manages the Early Science Program. Since 2009, he has worked with a number of large-scale projects using ALCF's supercomputers, especially those in the area of plasma physics.