Skip to main content

[PDF Version (Complete)]

[LinkedIN]

Education

  • Ph.D. in  Computer Science with certificate in Computational Science and Engineering, University of Illinois at Urbana-Champaign, December 2011.
    • Thesis:  Numerical Methods for Solar Tomography in the STEREO Era
    • Advisors: Dr. Michael T. Heath and Dr. Farzad Kamalabadi.
  • B.S. in Honors in Computer Science, Summa Cum Laude , Virginia Polytechnic Institute and State University (Virginia Tech), May 2005.
    • Thesis: Wavelet Analysis of Solar Active Regions.
    • Advisors: Dr. Calvin Ribbens (Virginia Tech) and Dr. Peter T. Gallagher (Trinity College Dublin).

Academic and Industrial Research Positions

  • Research Scientist, Computational Science and Engineering Dept., TOTAL E&P Research & Technology USA, May 2014--Present.
  • Postdoctoral Associate, Imaging and Computing Group, Department of Mathematics, Massachusetts Institute of Technology, September 2011--April 2014.
  • Postdoctoral Associate, Earth Resources Laboratory, Massachusetts Institute of Technology, September 2011--April 2014.

Fellowships and Grants

  • NASA Graduate Student Research Program (GSRP) Fellowship for Large Scale Dynamic Reconstruction of Coronal Density and Temperature from Multi-spacecraft Measurements, 2008--2011.

Other Research Experience

  • Research Assistant, University of Illinois at Urbana-Champaign

    June 2007--August 2007; January 2008--Present Under Prof. Farzad Kamalabadi. Enforcing non-negativity constraints when using the localized ensemble Kalman filter. Developing methods for scalable construction of tomographic projection operators.  Developing level set methods for tomography from extremely limited view points.

  • Visiting Scholar, Trinity College Dublin

    June 2006--September 2006 Under Dr. Peter T. Gallagher.  Developed wavelet methods for extracting magnetic power spectra from solar magnetic field images.

  • Junior Programmer, NASA Goddard Space Flight Center via L3--Communications GSI

    September 2004--September 2006 Under Dr. Peter T. Gallagher at NASA Goddard Space Flight Center.  Redesigned and reimplemented the SolarMonitor.org website, a website used by solar physicists around the world for mission planning and data analysis.  Began research on wavelet decompositions of solar data for space weather prediction.

  • Student Intern, NASA Goddard Space Flight Center via The Catholic University of America

    May 2003--August 2003, May 2004--August 2004 Under Dr. Edward Schmahl.  Developed software for processing, analysing, and presenting data from the Reuven Ramatty High Energy Solar Spectroscopic Imager (RHESSI) spacecraft.

  • Student Intern, NASA Goddard Space Flight Center via The Catholic University of America

    May 2001--August 2001 Under Mr. David C. Clark.  Designed software for assisting in the construction and calibration of the Burst Alert Telescope (BAT) on the SWIFT spacecraft.

  • Student Intern, NASA Goddard Space Flight Center via Eleanor Roosevelt High School

    August 2000--May 2001 Under Mr. David C. Clark. Designed software for assisting in the construction and calibration of the Burst Alert Telescope (BAT) on the SWIFT spacecraft.

  • Student Intern, NASA Goddard Space Flight Center via The Catholic University of America

    June 2000--August 2000 Under Mr. David C. Clark.  Assisted with calibration of the Roll Angle Sensor (RAS) on the Reuven Ramatty High Energy Solar Spectroscopic Imager (RHESSI) spacecraft.

Teaching Experience

  • Guest Lecturer, 18.325 Waves and Imaging, Massachusetts Institute of Technology, November, 2011
  • Guest Lecturer, CS498DH Computational Photography, University of Illinois, November, 2010
  • Teaching Assistant CS450 Intro to Numerical Analysis, University of Illinois, Fall 2007
  • Teaching Assistant CS450 Intro to Numerical Analysis, University of Illinois, Spring 2007
  • Teaching Assistant CS450 Intro to Numerical Analysis, University of Illinois, Fall 2006
  • Teaching Assistant CS450 Intro to Numerical Analysis, University of Illinois, Spring 2006
  • Teaching Assistant CS232 Intro to Computer Architecture II, University of Illinois, Fall 2005

Seminars and Workshops

  • Co-convenor, workshop, Open-source Software in Applied Geosciences, at 78th EAGE Conference & Exhibition 2016, Vienna, Austria, May, 2016.
  • Co-organizer, minisymposium, Advances in Software for Computational Geosciences, at 2015 SIAM Conference on Mathematical & Computational Issues in the Geosciences, Palo Alto, CA, June, 2015.
  • Co-organizer, minisymposium, Discontinuous Galerkin Methods in Seismology, at 2015 SIAM Conference on Mathematical & Computational Issues in the Geosciences, Palo Alto, CA, June, 2015.
  • Instructor for Computational Exercises, Introduction to the Mathematics of Seismic Imaging, Mathematical Sciences Research Institute (MSRI), July-August 2013.
  • Co-presenter, Python for Scientific and Engineering Workshop, University of Illinois SIAM Student Chapter and Engineering Graduate Student Advisory Council, April, 2011
  • Co-presenter, Python for Scientific Computing Workshop, University of Illinois SIAM Student Chapter, October, 2010

Peer Reviewed Publications

  • J. Chan, R. J. Hewett, and T. Warburton, "Weight Adjusted Discontinuous Galerkin Methods: Curvilinear Meshes," submitted to the SIAM Journal on Scientific Computing.
  • J. Chan, R. J. Hewett, and T. Warburton, "Weight Adjusted Discontinuous Galerkin Methods: Wave Propagation in Heterogeneous Media," submitted to the SIAM Journal on Scientific Computing.
  • J. Chan, R. J. Hewett, Z. Wang, and T. Warburton, "Reduced Storage Nodal Discontinuous Galerkin Methods on Semi-structured Prismatic Meshes," submitted to Computers and Mathematics with Applications.
  • The SunPy Community, et. al., "SunPy--Python for solar physics," Computational Science and Discovery, Volume 8, Issue 1, January, 2015.
  • R. J. Hewett, I. H. Jermyn, M. T. Heath, and F. Kamalabadi, "A Phase Field Method for Tomo-graphic Reconstruction from Limited Data," Proceedings of the British Machine Vision Conference, August, 2012, pp. 120.1--120.11.
  • R. J. Hewett, M. T. Heath, M. D. Butala, and F. Kamalabadi, "A Robust Null Space Method for Linear Equality Constrained State Estimation," IEEE Transactions on Image Processing, 2010, Volume 58, Issue 8, pp. 3961--3971.
  • M. D. Butala, R. J. Hewett, R. A. Frazin, and F. Kamalabadi, "Dynamic Three-Dimensional Tomography of the Solar Corona," Solar Physics, 2010, Volume 262, Issue 2, pp. 495--509.
  • J. Ireland, C. A. Young, R. T. J. McAteer, C. Whelan, R. J. Hewett, and P. T. Gallagher, "Multiresolution Analysis of Active Region Magnetic Structure and Its Correlation with the Mt. Wilson Classification and Flaring Activity," Solar Physics, 2008, Volume 252, Issue 1, pp. 121--137.
  • R. J. Hewett,, P. T. Gallagher, R. T. J. McAteer, C. A. Young, J. Ireland, P. A. Conlon, and K. Maguire, "Multiscale Analysis of Turbulence in Active Regions Using Wavelets," Solar Physics, 2010, Volume 248, Issue 2, pp. 297--309.
  • P. A. Conlon, P. T. Gallagher, R. T. J. McAteer, J. Ireland, C. A. Young, P. Kestener, R. J. Hewett, and K. Maguire, "Multifractal Properties of Evolving Active Regions," Solar Physics, 2010, Volume 248, Issue 2, pp. 311--322.

Conference Proceedings

  • M. N'Diaye, R. J. Hewett, A. Atle, H. Calandra, "Optimized finite difference coefficients for the Helmholtz equation," 85th Annual Meeting, SEG, Expanded Abstracts, October, 2015.
  • L. Zepeda--N'u~nez, R. J. Hewett, and L.~Demanet, "Preconditioning the 2D Helmholtz equation with polarized traces," 84th Annual Meeting, SEG, Expanded Abstracts, October, 2014.
  • L. Zepeda--N'u~nez, R. J. Hewett, M. Rao, and L.~Demanet, "Time-stepping beyond CFL: a locally one-dimensional scheme for acoustic wave propagation," 83rd Annual Meeting, SEG, Expanded Abstracts, September, 2013.
  • M. Leinonen, R. J. Hewett, X. Zhang, L. Ying, and L. Demanet, "High-dimensional wave atoms and compression of seismic datasets," 83rd Annual Meeting, SEG, Expanded Abstracts, September, 2013.
  • S. Mumford, D. P'erez-Su'arez, S. Christe, F. Mayer, and R. J. Hewett, "SunPy: Python for Solar Physicists," Proceedings of the 12th Python in Science Conference, July, 2013.
  • R. T. J. McAteer, P. T. Gallagher, J. Ireland, C. A. Young, R. J. Hewett, and P. Conlon, "The Complex Sun: Turbulence and Complexity of the Solar Atmosphere," SOHO-17. 10 Years of SOHO and Beyond, 2006.

Book Chapters

  • P. T. Gallagher, R. T. J. McAteer, C. A. Young, J. Ireland, R. J. Hewett, and P. A. Conlon, Solar Activity Monitoring, in Space Weather: Research Towards Applications in Europe, Ed: Jean Lilensten, Dordrecht, The Netherlands,  Springer, 2007.
  • B. Hewett, R. J. Hewett, IM Talking about Literacy: Instant Messaging in the Workplace, in ** Handbook of Research on Virtual Workplaces and the New Nature of Business Practices, Eds: Kirk St.Amant and Pavel Zemliansky, Hershey, PA, USA: IGI Global, 2008.

Presentations

  • Contributed Talk, "PySIT: Seismic Imaging Toolbox for Python," SIAM Conference on Mathematical and Computational Issues in Geoscience 2015, Stanford University, Palo Alto, CA, June 2015.
  • Contributed Talk, "A Polarized-Trace Solver for 2D Helmholtz and Frequency Domain Full-Waveform Inversion," Inverse Problems: Theory and Applications}, Bristol, UK, August 2014.
  • Contributed Talk, "Toward Tomographic Reconstruction of CMEs with a Phase Field Method," Solar Image Processing Workshop VI, Bozeman, MT, August 2012.
  • Contributed Talk, "Tomographic Imaging of the Solar Corona from Multi-spacecraft Measurements," Goddard Space Flight Center Graduate Student Symposium, Greenbelt, MD, September 2010.
  • Poster, "Joint Tomography and Segmentation of Coronal Mass Ejections," Solar Image Processing Workshop V, Les Diablerets, Switzerland, September 2010.
  • Contributed Talk, "Computing Tomographic Projection Operators on Unstructured Meshes," SIAM Imaging Science 2010, Chicago, IL, April 2010.
  • Poster, "An Assimilative 3-D Model of Coronal Density from Multi-Spacecraft Observations," American Geophysical Union, Fall Meeting 2009, abstract \#SH41B-1663, December 2009.
  • Poster, "Large Scale Dynamic Reconstruction of Coronal Density and Temperature from Multi-spacecraft Measurements," NASA Goddard Space Flight Center GSRP Symposium, Greenbelt, MD, September 2009.
  • Contributed Talk, "Dynamic 3D Coronal Density Reconstructions with Data from Multiple Observatories," Solar Image Processing Workshop IV, Baltimore, MD, October 2008.
  • Contributed Talk, "Multiscale Analysys of Turbulence in Active Regions Using Wavelets," Solar Image Processing Workshop III, Dublin, Ireland, September 2006.
  • Poster, "Multiscale Structure of Active Region Magnetic Fields: A Continuous Wavelet Approach" American Astronomical Society: Solar Physics Division Annual Meeting, Durham, NH, June 2006.

Honors and Awards

  • First Place Industry Prize in Virginia Tech Undergraduate Research in Computer Science (VTURCS), Spring 2005.
  • Phi Beta Kappa, 2005.
  • Upsilon Pi Epsilon, 2004.
  • First Place Judge's Prize in Virginia Tech Undergraduate Research in Computer Science (VTURCS), Spring 2002. (with D. Arendt and J. Giacalone)

Professional Organizations

  • Member, Society for Industrial and Applied Mathematics (SIAM), 2011--Present.
  • Student Member, Society for Industrial and Applied Mathematics (SIAM), 2008--2011.