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Omar Ghattas

Omar Ghattas is the John A. and Katherine G. Jackson Chair in Computational Geosciences; Director of the Center for Computational Geosciences in the Institute for Computational Engineering and Sciences; Professor of Geological Sciences and affiliated faculty in the Institute for Geophysics within the Jackson School of Geosciences; Professor of Mechanical Engineering and, by courtesy, Biomedical Engineering and Computer Sciences; and Chief Applications Scientist for the NSF Track-2 supercomputer at the Texas Advanced Supercomputing Center; at the University of Texas at Austin. Prior to September 2005, he was Professor of Civil & Environmental Engineering and of Biomedical Engineering, and Director of the Ultrascale Simulation Laboratory, at Carnegie Mellon University. He received his BS, MS, and PhD from Duke University in 1984, 1986, and 1988, respectively. He joined CMU in 1989 after serving as a postdoctoral research associate at Duke. He has been a visiting professor at the Institute for Computer Applications in Science and Engineering (ICASE) at NASA-Langley Research Center; the Center for Applied Scientific Computing (CASC) at Lawrence Livermore National Laboratory; and the Computer Science Research Institute (CSRI) at Sandia National Laboratories. Ghattas has general research interests in simulation and optimization of complex solid and fluid phenomena in the geo-, bio-, and mechanical engineering sciences. He specializes in large-scale inverse problems, and their solution on parallel supercomputers. His research activities include serving as principal or co-principal investigator on nine multi-institution group grants: the Earthquake Ground Motion Modeling project (NSF Grand Challenge); the Computer-Assisted Surgery project (NSF National Challenge); the Inversion-Based Seismic Modeling project (NSF KDI); the Simulation of Flows with Dynamic Interfaces project (NSF ITR); the Real-Time Inversion and Control of Dynamic Simulations project (NSF ITR); the Terascale Optimal PDE Simulations project (DOE SciDAC); the Ultrascale Forward and Inverse Earthquake Earthquake Modeling project (NSF ITR); the Image-Driven Inverse Cardiac Modeling project (NSF ITR); and the Contaminant Source Inversion and Evolution Prediction project (NSF DDDAS). His recent professional activities have included membership on the review board for NSF's supercomputing centers (PACI) program; organization of several conferences and workshops in high performance scientific computing, including serving as chair of the organizing committee of the SIAM Conference on Computational Science and Engineering in 2003 and as co-organizer of the IMA Workshop on Simulation-Based Optimization in 2003 and Sandia Workshops on PDE-Constrained Optimization in 2001, 2004, and 2007; Program Director for SIAM's Computational Science & Engineering Activity Group; founding editor-in-chief of SIAM's Computational Science and Engineering series; Associate Editor of the SIAM Journal on Scientific Computing}; editorial board member of the Journal for Multiscale Computational Engineering, Computer Methods in Applied Mechanics and Engineering, Inverse Problems, and four other journals; member of the SIAM Program Committee; and member of the Science Steering Committee for the Computational Infrastructure for Geodynamics (CIG) project. He is a co-recipient of the 1998 Allen Newell Medal for Research Excellence, the 2003 Gordon Bell Prize for Special Accomplishment in Supercomputing, the 2004--2005 CMU College of Engineering Outstanding Research Prize, and the HPC Analytics Award at SC'06. His paper on inverse wave propagation with former students V. Akcelik and G. Biros received the SC2002 Best Technical Paper award.

Most Recent Publications

  1. T. Bui-Thanh, O. Ghattas, D. Higdon, "Adaptive Hessian-based non-stationary Gaussian process response surface method for probability density approximation with application to Bayesian solution of large-scale inverse problems," SIAM Journal On Scientific Computing, (2012)
  2. T. Bui-Thanh, L. Demkowicz, and O. Ghattas, "Constructively well-posed approximation methods with unity inf-sup and continuity constants for partial di fferential equations," Mathematics Of Computation, (2012)
  3. T. Bui-Thanh and O. Ghattas, "Analysis of the Hessian for inverse scattering problems. Part II: Inverse medium scattering of acoustic waves," Inverse Problems, Vol. 28, (2012), 5, pp. 1-20
  4. T. Bui-Thanh and O. Ghattas, "Analysis of the Hessian for inverse scattering problems. Part I: Inverse shape scattering of acoustic waves," Inverse Problems, Vol. 28, (2012), 5, pp. 1-38
  5. T. Bui-Thanh and O. Ghattas, "Analysis of an hp-non-conforming discontinuous Galerkin spectral element method for wave propagation," SIAM Journal On Numerical Analysis, Vol. 50, (2012), 3, pp. 1801-1826
  6. N. Petra, H. Zhu, G. Stadler, T.J.R. Hughes, O. Ghattas, "A scalable adjoint-based inexact Newton method for inversion of basal sliding and rheology parameters in a nonlinear Stokes ice sheet model," Journal Of Glaciology, (2012)
  7. L. Alisic, M. Gurnis, G. Stadler, C. Burstedde, and O. Ghattas, "Multi-scale dynamics and rheology of mantle flow with plates," Journal Of Geophysical Research - Solid Earth, (2012)
  8. J. Martin, L.C. Wilcox, C. Burstedde, and O. Ghattas, "A Stochastic Newton MCMC Method for Large-Scale Statistical Inverse Problems with Application to Seismic Inversion," SIAM Journal On Scientific Computing, Vol. 34, (2012), 3, pp. 1460-1487
  9. S. Yang, G. Stadler, R.M. Moser, and O. Ghattas, "A shape Hessian-based boundary roughness analysis of Navier-Stokes flows," SIAM Journal On Applied Mathematics, Vol. 71, (2011), 1, pp. 333-355
  10. L.F. Kallivokas, S.-W. Na, O. Ghattas, B. Jaramaz, "Assessment of a fictitious domain method for patient-specifi c biomechanical simulation of press-fi t orthopedic implantation," Computer Methods In Biomechanics And Biomedical Engineering, (2011), pp. 1-19