Research Interests
Planetary geology and geophysics, overland altimetry/topography, Crustal magnetic anomalies, early planetary crustal evolution, comparative planetology
Positions/Employment
Chief, Planetary Geodynamics Laboratory, NASA/Goddard Space Flight Center
1993 -
Present
Nasa Goddard Space Flight Center, Greenbelt MD
Manager, Mars Data Analysis and Mars Fundamental Research Programs
2001 -
2004
NASA HQ, Washington , DC
Manager, Solid Earth & Natural Hazards Program Support Office
1996 -
Present
NASA GSFC, Greenbelt MD
Study Scientist, Gravity and Magnetic Earth Surveyor (GAMES)
1992 -
1994
NASA GSFC, Greenbelt, MD
Staff Scientist, Geodynamics Branch
1989 -
1992
NASA/GSFC, Greenbelt, MD
Convenor, Coolfont Workshop on NASA Solid Earth Science
1989 -
1989
NASA/GSFC, Greenbelt, MD
Program Manager (acting), Geodynamics Program
1989 -
1989
NASA HQ, Washington, DC
Investigations Manager, Crustal Dynamics Project
1988 -
1991
NASA/GSFC, Greenbelt, MD
Assistant Project Scientist, Crustal Dynamics Project
1981 -
1991
NASA/GSFC, Greenbelt, MD
Associate Editor (Planetology) IUGG Quadrennial Report
1979 -
1979
NASA/GSFC, Greenbelt, MD
Staff Scientist, Geophysics Branch
1979 -
1989
NASA/GSFC, Greenbelt, MD
Research Associate, NASA/Goddard Space Flight Center and Astronomy Program
1977 -
1979
University of Maryland College Park, College Park, MD
Education
1968 - BA (Astronomy), Haverford College, Haverford, PA1977 - PhD (Astronomy), University of Maryland, College Park, MD
[Thesis: Crustal Evolution in the Early Earth: Basin-forming Impacts, Crustal Dichotomy, and Plate Tectonics]
Publications
LILLIS, R., M. E. PURUCKER, J. HALEKAS, K. LOUZADA, S. A. STEWART, M. MANGA, and H. V. FREY. 2010. Study of impact demagnetization at Mars using Monte Carlo modeling and multiple altitude data. Journal of Geophysical Research-Planets. 115 E07007. [10.1029/2009JE003556]
SOLOMON, S. C., O. AHARONSON, J. M. AURNOU, B. BANERDT, B. BANERDT, M. H. CARR, A. J. DOMBARD, H. V. FREY, M. P. GOLOMBEK, S. A. HAUCK II, J. H. HEAD III, B. M. JAKOSKY, C. L. JOHNSON, P. J. MCGOVERN, G. A. NEUMANN, R. J. PHILLIPS, D. E. SMITH, and M. T. ZUBER. 2005. New perspectives on ancient Mars. Science. 307 12141220. [10.1126/science.1101812]
BUCZKOWSKI, D. L., H. V. FREY, J. H. ROARK, and G. E. MCGILL. 2005. Buried impact craters, a topographic analysis of quasicircular depressions, Utopia Basin, Mars. Journal Geophysical Research. 110 E03007. [ 10.1029/2004JE002324]
ROARK, J. H., H. V. FREY, and C. M. MASUOKA. 2004. Recent Improvements in Research and Education Software for Exploring Mars Topography.
ROARK, J. H., J. W. KELLER, F. NIEPOLD, S. E. SAKIMOTO, S. STOCKMAN, and H. V. FREY. 2003. 3-Dimensional Topographic Models of Geologic Features for the Classroom. GSA Annual Meeting, Seattle WA, abstract 66476.
FREY, H. V., J. H. ROARK, G. J. HOHNER, A. WERNECKE, and S. E. SAKIMOTO. 2002. Impact Basins as Constraints on the Thickness of Ridged Plains and Northern Lowland Plains on Mars. LPSC XXXIV.
FREY, H. V., J. H. ROARK, K. M. SCHOCKEY, E. L. FREY, and S. E. SAKIMOTO. 2002. Ancient lowlands on Mars. Geophys Res Lett 29. 1384 101029/2001GL013832.
ROARK, J. H., and H. V. FREY. 2001. GRIDVIEW: Recent Improvements in Research and Education Software for Exploring Mars Topography. LPSC XXXIII, abstract 1618.
BRADLEY, B. A., S. E. SAKIMOTO, H. FREY, and J. R. ZIMBELMAN. 2001. The Medusae Fossae Formation, Mars: new views from Mars Global Surveyor data. J Geophys Res (Planets). 107 117. [ 10.1029/2001JE001537]
ROARK, J. H., H. V. FREY, and S. E. SAKIMOTO. 2000. Interactive graphics tools for analysis of MOLA and other data. LPSC XXXI, Houston, TX, Abstract 2026.
PURUCKER, M., D. RAVAT, H. FREY, C. VOORHIES, T. SABAKA, and M. ACUNA. 2000. An altitude-normalized magnetic map of Mars and its interpretation. Geophys Res Lett 27. 27 2449-2452.
SAKIMOTO, S., H. V. FREY, J. B. GARVIN, and J. H. ROARK. 1999. Topography roughness and slope properties of the Medusae Fossae Formation from Mars Orbiter Laser Altimeter (MOLA) Data. J Geophys Res (Planets). 104 141-144. [10.1029/1999JE001044]
SMITH, D. E., M. T. ZUBER, S. C. SOLOMON, R. J. PHILLIPS, J. W. HEAD, J. B. GARVIN, W. B. BANERDT, H. V. FREY, D. O. MUHLEMAN, G. H. PETTENGILL, G. A. NEUMANN, F. G. LEMOINE, J. B. ABSHIRE, O. AHARONSON, C. D. BROWN, S. A. HAUCK, A. B. IVANOV, P. J. MCGOVERN, H. J. ZWALLY, and T. C. DUXBURY. 1999. The global topography of Mars and implications for surface evolution. Science. 284 1495-1503. [ 10.1126/science.284.5419.1495]
FREY, H., S. SAKIMOTO, and J. ROARK. 1999. Discovery of a 450 km diameter, multi-ring basin on Mars through analysis of MOLA topographic data. Geophys Res Lett. 26 1657-1660.
FREY, H. V., L. HUTCHISON, J. H. ROARK, and S. E. SAKIMOTO. 1999. New candidate ancient impact basins on Mars found through analysis of MOLA profile and gridded data. GSA Annual Meeting, Denver, CO, .
FREY, H. V., S. E. SAKIMOTO, and J. H. ROARK. 1999. Discovery of a 450 km diameter, multiring basin on Mars through analysis of MOLA data. Geophys Res Lett. 26 16571660. [ 10.1029/1999GL900357]
SAKIMOTO, S. E., H. V. FREY, J. B. GARVIN, and J. H. ROARK. 1999. Topography, roughness and slope properties of the Medusae Fossae Formation from Mars Orbiter Laser Altimeter (MOLA) Data. J Geophys Res (Planets). 104 141-144.
FREY, H. V., B. G. BILLS, R. S. NEREM, and J. H. ROARK. 1996. The isostatic state of martian topography. Geophys Res Lett 23. -721-724 101029/96GL00744.
LILLIS, R.,
M. E. PURUCKER,
J. HALEKAS,
K. LOUZADA,
S. A. STEWART,
M. MANGA,
and
H. V. FREY.
2010. Study of impact demagnetization at Mars using Monte Carlo modeling and multiple altitude data.
Journal of Geophysical Research-Planets.
115 E07007.
[10.1029/2009JE003556]
SOLOMON, S. C., O. AHARONSON, J. M. AURNOU, B. BANERDT, B. BANERDT, M. H. CARR, A. J. DOMBARD, H. V. FREY, M. P. GOLOMBEK, S. A. HAUCK II, J. H. HEAD III, B. M. JAKOSKY, C. L. JOHNSON, P. J. MCGOVERN, G. A. NEUMANN, R. J. PHILLIPS, D. E. SMITH, and M. T. ZUBER. 2005. New perspectives on ancient Mars. Science. 307 12141220. [10.1126/science.1101812]
BUCZKOWSKI, D. L., H. V. FREY, J. H. ROARK, and G. E. MCGILL. 2005. Buried impact craters, a topographic analysis of quasicircular depressions, Utopia Basin, Mars. Journal Geophysical Research. 110 E03007. [ 10.1029/2004JE002324]
ROARK, J. H., H. V. FREY, and C. M. MASUOKA. 2004. Recent Improvements in Research and Education Software for Exploring Mars Topography.
ROARK, J. H., J. W. KELLER, F. NIEPOLD, S. E. SAKIMOTO, S. STOCKMAN, and H. V. FREY. 2003. 3-Dimensional Topographic Models of Geologic Features for the Classroom. GSA Annual Meeting, Seattle WA, abstract 66476.
FREY, H. V., J. H. ROARK, G. J. HOHNER, A. WERNECKE, and S. E. SAKIMOTO. 2002. Impact Basins as Constraints on the Thickness of Ridged Plains and Northern Lowland Plains on Mars. LPSC XXXIV.
FREY, H. V., J. H. ROARK, K. M. SCHOCKEY, E. L. FREY, and S. E. SAKIMOTO. 2002. Ancient lowlands on Mars. Geophys Res Lett 29. 1384 101029/2001GL013832.
ROARK, J. H., and H. V. FREY. 2001. GRIDVIEW: Recent Improvements in Research and Education Software for Exploring Mars Topography. LPSC XXXIII, abstract 1618.
BRADLEY, B. A., S. E. SAKIMOTO, H. FREY, and J. R. ZIMBELMAN. 2001. The Medusae Fossae Formation, Mars: new views from Mars Global Surveyor data. J Geophys Res (Planets). 107 117. [ 10.1029/2001JE001537]
ROARK, J. H., H. V. FREY, and S. E. SAKIMOTO. 2000. Interactive graphics tools for analysis of MOLA and other data. LPSC XXXI, Houston, TX, Abstract 2026.
PURUCKER, M., D. RAVAT, H. FREY, C. VOORHIES, T. SABAKA, and M. ACUNA. 2000. An altitude-normalized magnetic map of Mars and its interpretation. Geophys Res Lett 27. 27 2449-2452.
SAKIMOTO, S., H. V. FREY, J. B. GARVIN, and J. H. ROARK. 1999. Topography roughness and slope properties of the Medusae Fossae Formation from Mars Orbiter Laser Altimeter (MOLA) Data. J Geophys Res (Planets). 104 141-144. [10.1029/1999JE001044]
SMITH, D. E., M. T. ZUBER, S. C. SOLOMON, R. J. PHILLIPS, J. W. HEAD, J. B. GARVIN, W. B. BANERDT, H. V. FREY, D. O. MUHLEMAN, G. H. PETTENGILL, G. A. NEUMANN, F. G. LEMOINE, J. B. ABSHIRE, O. AHARONSON, C. D. BROWN, S. A. HAUCK, A. B. IVANOV, P. J. MCGOVERN, H. J. ZWALLY, and T. C. DUXBURY. 1999. The global topography of Mars and implications for surface evolution. Science. 284 1495-1503. [ 10.1126/science.284.5419.1495]
FREY, H., S. SAKIMOTO, and J. ROARK. 1999. Discovery of a 450 km diameter, multi-ring basin on Mars through analysis of MOLA topographic data. Geophys Res Lett. 26 1657-1660.
FREY, H. V., L. HUTCHISON, J. H. ROARK, and S. E. SAKIMOTO. 1999. New candidate ancient impact basins on Mars found through analysis of MOLA profile and gridded data. GSA Annual Meeting, Denver, CO, .
FREY, H. V., S. E. SAKIMOTO, and J. H. ROARK. 1999. Discovery of a 450 km diameter, multiring basin on Mars through analysis of MOLA data. Geophys Res Lett. 26 16571660. [ 10.1029/1999GL900357]
SAKIMOTO, S. E., H. V. FREY, J. B. GARVIN, and J. H. ROARK. 1999. Topography, roughness and slope properties of the Medusae Fossae Formation from Mars Orbiter Laser Altimeter (MOLA) Data. J Geophys Res (Planets). 104 141-144.
FREY, H. V., B. G. BILLS, R. S. NEREM, and J. H. ROARK. 1996. The isostatic state of martian topography. Geophys Res Lett 23. -721-724 101029/96GL00744.
SOLOMON, S. C., O. AHARONSON, J. M. AURNOU, B. BANERDT, B. BANERDT, M. H. CARR, A. J. DOMBARD, H. V. FREY, M. P. GOLOMBEK, S. A. HAUCK II, J. H. HEAD III, B. M. JAKOSKY, C. L. JOHNSON, P. J. MCGOVERN, G. A. NEUMANN, R. J. PHILLIPS, D. E. SMITH, and M. T. ZUBER. 2005. New perspectives on ancient Mars. Science. 307 12141220. [10.1126/science.1101812]
BUCZKOWSKI, D. L., H. V. FREY, J. H. ROARK, and G. E. MCGILL. 2005. Buried impact craters, a topographic analysis of quasicircular depressions, Utopia Basin, Mars. Journal Geophysical Research. 110 E03007. [ 10.1029/2004JE002324]
ROARK, J. H., H. V. FREY, and C. M. MASUOKA. 2004. Recent Improvements in Research and Education Software for Exploring Mars Topography.
ROARK, J. H., J. W. KELLER, F. NIEPOLD, S. E. SAKIMOTO, S. STOCKMAN, and H. V. FREY. 2003. 3-Dimensional Topographic Models of Geologic Features for the Classroom. GSA Annual Meeting, Seattle WA, abstract 66476.
FREY, H. V., J. H. ROARK, G. J. HOHNER, A. WERNECKE, and S. E. SAKIMOTO. 2002. Impact Basins as Constraints on the Thickness of Ridged Plains and Northern Lowland Plains on Mars. LPSC XXXIV.
FREY, H. V., J. H. ROARK, K. M. SCHOCKEY, E. L. FREY, and S. E. SAKIMOTO. 2002. Ancient lowlands on Mars. Geophys Res Lett 29. 1384 101029/2001GL013832.
ROARK, J. H., and H. V. FREY. 2001. GRIDVIEW: Recent Improvements in Research and Education Software for Exploring Mars Topography. LPSC XXXIII, abstract 1618.
BRADLEY, B. A., S. E. SAKIMOTO, H. FREY, and J. R. ZIMBELMAN. 2001. The Medusae Fossae Formation, Mars: new views from Mars Global Surveyor data. J Geophys Res (Planets). 107 117. [ 10.1029/2001JE001537]
ROARK, J. H., H. V. FREY, and S. E. SAKIMOTO. 2000. Interactive graphics tools for analysis of MOLA and other data. LPSC XXXI, Houston, TX, Abstract 2026.
PURUCKER, M., D. RAVAT, H. FREY, C. VOORHIES, T. SABAKA, and M. ACUNA. 2000. An altitude-normalized magnetic map of Mars and its interpretation. Geophys Res Lett 27. 27 2449-2452.
SAKIMOTO, S., H. V. FREY, J. B. GARVIN, and J. H. ROARK. 1999. Topography roughness and slope properties of the Medusae Fossae Formation from Mars Orbiter Laser Altimeter (MOLA) Data. J Geophys Res (Planets). 104 141-144. [10.1029/1999JE001044]
SMITH, D. E., M. T. ZUBER, S. C. SOLOMON, R. J. PHILLIPS, J. W. HEAD, J. B. GARVIN, W. B. BANERDT, H. V. FREY, D. O. MUHLEMAN, G. H. PETTENGILL, G. A. NEUMANN, F. G. LEMOINE, J. B. ABSHIRE, O. AHARONSON, C. D. BROWN, S. A. HAUCK, A. B. IVANOV, P. J. MCGOVERN, H. J. ZWALLY, and T. C. DUXBURY. 1999. The global topography of Mars and implications for surface evolution. Science. 284 1495-1503. [ 10.1126/science.284.5419.1495]
FREY, H., S. SAKIMOTO, and J. ROARK. 1999. Discovery of a 450 km diameter, multi-ring basin on Mars through analysis of MOLA topographic data. Geophys Res Lett. 26 1657-1660.
FREY, H. V., L. HUTCHISON, J. H. ROARK, and S. E. SAKIMOTO. 1999. New candidate ancient impact basins on Mars found through analysis of MOLA profile and gridded data. GSA Annual Meeting, Denver, CO, .
FREY, H. V., S. E. SAKIMOTO, and J. H. ROARK. 1999. Discovery of a 450 km diameter, multiring basin on Mars through analysis of MOLA data. Geophys Res Lett. 26 16571660. [ 10.1029/1999GL900357]
SAKIMOTO, S. E., H. V. FREY, J. B. GARVIN, and J. H. ROARK. 1999. Topography, roughness and slope properties of the Medusae Fossae Formation from Mars Orbiter Laser Altimeter (MOLA) Data. J Geophys Res (Planets). 104 141-144.
FREY, H. V., B. G. BILLS, R. S. NEREM, and J. H. ROARK. 1996. The isostatic state of martian topography. Geophys Res Lett 23. -721-724 101029/96GL00744.
