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- Research ScientistOak Ridge National Laboratory

- Research ScientistSandia National Laboratories

- Professor of Physical ChemistryUniversity College London

- Computational Scientist in MathematicsOak Ridge National Laboratory

- Senior Computational Earth ScientistOak Ridge National Laboratory

- Director of ScienceOak Ridge National Laboratory

- Computational PhysicistSandia National Laboratories

- Director of CSCSSwiss National Supercomputing Centre
