B.A. (1986) University of Wisconsin at Madison

M.S. (1990) University of California at Los Angeles

Ph.D. (1995) University of California at Los Angeles

Planetary Science, Geodynamics, Geological Fluid Dyanmics, Geothermics, Climate-Solid Planet Coupling, Mantle Processes

Email: ajns@rice.edu
Phone: (713) 348-4883
Office: 205 F Geology Building

First Five Years in Croatia. Formative (and skateboard) Years in Wisconsin. Higher Eduction (and surfboard) Years in California. Married, very happily to Jennifer, with Real Job and House (and multiple snowboard trip) Years in Houston.

My research involves geodynamical modeling applied to problems of coupled mantle flow, heat loss, and tectonics. A key focus is on understanding the coupling between mantle flow and continental dynamics, mainly through the use of numerical models. Examples include the use of heat flow data and numerical modeling to map the effects of continents on mantle heat loss; understanding how mantle stresses are transmitted through continental plates; modeling the structure of continental lithosphere using seismic and geochemical data as constraints; and work related to the broad issue of how continents interact with and alter large scale mantle convection. My interest in thermal/chemical convection has also taken my research efforts to studies of magma chamber evolution. Another key research focus is incorporating hydrosphere related process (e.g., erosion, water induced weakening of rocks) into models of coupled mantle flow and crustal deformation. My interest in the effects of water on the Earth's thermo-tectonic evolution has also lead me to explore how the lack of water may have effected the evolution of Venus and into problems of comparative planetology in general.

Publications

Li, Z.A., C.A. Lee, A.H. Peslier, A. Lenardic, and S.J. Mackwell "Water contents in mantle xenoliths from the colorado plateau and vicinity: implications for the rheology and hydration-induced thinning of continental lithosphere."  J. Geophys. Res. - Solid Earth, 113 (2008).

Hoink, T., and A. Lenardic "Three-dimensional mantle convection simulations with a low-viscosity asthenosphere and the relationship between heat flow and the horizontal length scale of convection."  Geophys. Res. Lett., 35 (2008).

Lenardic, A., and A.M. Jellinek "The tails of two plume types in one mantle."  Geology (2008).(In Press)

Lee, C.A., P. Luffi, T. Hoink, Z.A. Li, and A. Lenardic "The role of serpentine in preferential craton formation is the late Archean by lithosphere underthrusting."  Earth Planet. Sci. Lett., 269 (2008): 96-104.

Hoink, T., C.T. Lee, J.C. Hawthorne, and A. Lenardic "Paleo-viscometry of magma chambers."  Earth Planet. Sci. Lett., 267 (2008): 100-106.

O'Neill, C., A. Lenardic, A.M. Jellinek, and L.-N. Moresi "Influence of supercontinents on deep mantle flow."  Gondwana Research (2008).(In Press)

Jellinek, A.M., and A. Lenardic "Effects of spatially varying roof cooling on Rayleigh-Benard convection in a fluid with temperature-dependent viscosity."  J. Fluid Mech. (2008).(In Revision)

O'Neill, C., A. Lenardic, W.L. Griffin, and S. O'Reilly "Dynamics of cratons in an evolving mantle."  Lithos, 102 (2008): 12-24.

Lenardic, A., A.M. Jellinek, and L.-N. Moresi "A climate change induced transition in the tectonic style of a terrestrial planet."  Earth Planet. Sci. Lett., 271 (2008): 34-42.

O'Neill, C., A.M. Jellinek, and A. Lenardic "Conditions for the onset of plate tectonics on terrestrial planets and moons."  Earth Planet. Sci. Lett., 261 (2007): 20-32.

O'Neill, C., A. Lenardic, L.-N. Moresi, T. Torsvik, and C.A. Lee "Episodic precambrian subduction."  Earth Planet. Sci. Lett., 262 (2007): 552-562.

O'Neill, C., and A. Lenardic "Geological consequences of super-sized earths."  Geophys. Res. Lett., 34 (2007): L19204.

O'Neill, C., A. Lenardic, A.M. Jellinek, and W. Kiefer "Martian volcanism and atmospheric evolution from mantle convection simulations."  J. Geophys. Res. - Planets, 112 (2007): E07003.

Smrekar, S., L. Elkins-Tanton, J. Leitner, A. Lenardic, S. Mackwell, L.-N. Moresi, C. Sotin, and E. Stofan "Tectonic and thermal evolution of Venus and the role of volatiles: Implications for understanding the terrestrial planets."  Venus as a Terrestrial Planet (2007).

Lee, C.A., Q.-Z. Yin, A. Lenardic, A. Agranier, C.J. O'Neill, and N. Thiagarajan "Trace element composition of Fe-rich residual liquids formed by fractional crystallization: implications for the Hadean magma ocean,."  Geochemica Cosmochemica Acta, 71 (2007): 3601-3615.

Robin, C.M.I, A.M. Jellinek, V. Thayalan, V. and A. Lenardic "Transient regimes in Benard convection in a fluid with a temperature-dependent viscosity and imposed large-scale stirring: Applications to Venus."  Earth Planet. Sci. Lett., 256 (2007): 100-119.

Robin, C.M.I, A.M. Jellinek, V. Thayalan, V. and A. Lenardic "Transient regimes in Benard convection in a fluid with a temperature-dependent viscosity and imposed large-scale stirring: Applications to Venus."  Earth Planet. Sci. Lett. (2006).(In Revision)

Lenardic, A., A.M. Jellinek, and L.-N. Moresi "The potential of a climate change induced transition in the global tectonic style of a terrestrial planet."  Earth Planet. Sci. Lett. (2006).(Submitted)

Cooper, C.M., A. Lenardic, A. Levander, and L.-N. Moresi "The creation of cratonic lithosphere: seismic constraints and geodynamic models."  Archean Geodynamic Processes (2006): 75-88.

Smrekar, S., L. Elkins-Tanton, J. Leitner, A. Lenardic, S. Mackwell, L.-N. Moresi, E.M. Parmentier, and E. Stofan "Tectonic and thermal evolution of Venus and the role of volatiles: Implications for understanding the terrestrial planets."  Venus as a Terrestrial Planet (2006).(Submitted)

Levander, A., A. Lenardic, and K. Karlstrom "Structure of the continental crust."  Evolution and Differentiation of the Continental Crust (2006): Chptr 2.

Lee, C.A., A. Lenardic, N. Thiagarajan, A. Agranier, C.J. O'Neill, and Q.-Z. Yin "Remnant iron oxide/sulfide mattes from a Hadean magma ocean at the core-mantle boundary: insights from a small scale post-Archean analog."  Earth Planet. Sci. Lett. (2006).(Submitted)

Thayalan, V., A.M. Jellinek, and A. Lenardic "Recycling the lid: Effects of subduction and stirring on lower boundary layer dynamics in bottom-heated planetary mantle convection."  Geophys. Res. Lett., 33 (2006): L20318.

O'Neill, C., A. Lenardic, A.M. Jellinek, and W. Kiefer "Martian volcanism and atmospheric evolution from mantle convection simulations."   (2006).(In Revision)

O'Neill, C., A. Lenardic, L.-N. Moresi, T. Torsvik, and C.A. Lee "Episodic precambrian subduction."  Nature (2006).(Submitted)

Cooper, C.M., A. Lenardic, and L.-N. Moresi "Effects of continental insulation and the partioning of heat producing elements on the Earth's heat loss."  Geophys. Res. Lett., 33 (2006): 10.1029.

O'Neill, C., A. Lenardic, W.L. Griffin, and S. O'Reilly "Dynamics of cratons in an evolving mantle."  Lithos (2006).(Submitted)

Lenardic, A., M.A. Richards, and F.H. Busse "Depth-dependent rheology and the horizontal length-scale of mantle convection."  J. Geophys. Res., 111 (2006).

Lenardic, A. "Continental growth and the archean paradox."  Archean Geodynamic Processes (2006): 33-46.

O'Neill, C., A.M. Jellinek, and A. Lenardic "Conditions for the onset of plate tectonics on terrestrial planets and moons."  Earth Planet. Sci. Lett. (2006).(Submitted)

Busse, F.H., M.A. Richards, and A. Lenardic "A simple model of high Prandtl and high Rayleigh number convection bounded by thin low viscosity layers."  Geophys. J. Int., 164 (2006): 160-167.

Lee, C.A., A. Lenardic, C.M. Cooper, F. Niu, and A. Levander "The role of chemical boundary layers in regulating the thickness of continental and oceanic thermal boundary layers."  Earth Planet. Sci. Lett., 230 (2005): 379-395.

O'Neill, C., L.-N. Moresi, and A. Lenardic "Growth of crustal units on Mars and Earth: effects of depletion and insulation."  Geophys. Res. Lett., 32 (2005): 10.1029/2005GL022855.

Lenardic, A., L.-N. Moresi, A.M. Jellinek, and M. Manga "Continental insulation, mantle cooling, and the surface area of oceans and continents."  Earth Planet. Sci. Lett., 234 (2005): 317-333.

Lenardic, A., F.Nimmo, and L.-N. Moresi "Growth of the hemispheric dichotomy and the cessation of plate tectonics on Mars."  J. Geophys. Res., 109 (2004): 10.1029/2003JE002172.

Niu, F., A. Levander, C.M. Cooper, C.A., Lee, A. Lenardic, and D.E. James "Seismic constraints on the depth and composition of the mantle keel beneath the Kaapvaal craton."  Earth Planet. Sci. Lett., 224 (2004): 337-346.

Cooper, C.M., A. Lenardic, and L.-N. Moresi "The thermal structure of stable continental lithosphere within a dynamic mantle."  Earth Planet. Sci. Lett., 222 (2004): 807-817.

Lenardic, A., and L.-N. Moresi "Thermal convection below a conducting lid of variable extent: heat flow scalings and two-dimensional, infinite Prandtl number numerical simulations."  Phys. Fluids, 15 (2003): 455-466.

Lenardic, A., L.-N. Moresi, and H. Muhlhaus "Longevity and stability of cratonic lithosphere: insights from numerical simulations of coupled mantle convection and continental tectonic."  J. Geophys. Res. - Solid Earth, 108 (2003).

O'Neill, C., L.-N. Moresi, A. Lenardic, and C.M. Cooper "Inferences on Australias heat flow and thermal structure from mantle convection modelling results."  The Australian Plate, Geological Society of Australia Special Publication, 22 (2003).

Jellinek, A.M., Lenardic, A. and M. Manga "The influence of interior mantle temperature on the structure of plumes: heads for Venus tails for Earth."  Geophys. Res. Lett., 29 (2002): 10.1029.

Lenardic, A., and L-N. Moresi "Heat flux scalings for mantle convection below a conducting lid: resolving seemingly inconsistent modeling results regarding continental heat flow."  Geophys. Res. Lett., 28 (2001): 1311-1314.

Lenardic, A., L. Guillou-Frottier, J.-C. Mareschal, C. Jaupart, L.-N. Moresi, and W.M. Kaula "What the mantle sees: the effects of continents on mantle heat flow."  The History and Dynamics of Global Plate Motions, AGU Press (2000): 95-112.

Lenardic, A., L.-N. Moresi, and H. Muhlhaus "The role of mobile belts for the longevity of deep cratonic lithosphere: the crumple zone model."  Geophys. Res. Lett., 27 (2000): 1235-1238.

Lenardic, A., and L.-N. Moresi "A new class of equilibrium lithospheric geotherms."  Earth Planet. Sci. Lett., 176 (2000): 331-338.

Lenardic, A., C.O'Neill, C. Sandu, and C.M. Cooper "Everything falls apart: Earth's evolving stress state and the past, present, and future stability of cratonic lithosphere."  Earth Planet. Sci. Lett. (2--8).(Submitted)

Moresi, L.-N., and A. Lenardic "Three-dimensional mantle convection with continental crust: first-generation numerical simulations."  Earth Interactions, 3 (1999): 002.

Lenardic, A., and L.-N. Moresi "Some thoughts on the stability of cratonic lithosphere: the effects of buoyancy and viscosity."  J. Geophys. Res.-B, 104 (1999): 12,747-12,758.

Lenardic, A. "On the partitioning of mantle heat loss below oceans and continents over time and its relationship to the Archean paradox."  Geophys. J. Int., 134 (1998): 706-720.

Presentations

"Mantle episodicity from within and from above."  AGU Fall Meeting, .  (Dec 2008) With C. O'Neill, A.M. Jellinek, and L. Moresi.

"The essence of a craton."  University of Texas at Austin, Department of Geology, University of Texas at Austin.  (Oct. 2002)

"The stability of a visco-plastic chemical boundary layer above a convecting mantle."  AGU Fall Meeting, San Francisco.  (Dec 8 -12, 2003) With Cooper, C.M. and L.-N. Moresi.

Lead Author and Presenter.  "The surface area of oceans and continents and the cooling of the Earth."  AGU fall meeting, San Francisco.  (2005) With L.-N. Moresi, A.M. Jellinek, M. Manga, and C.M. Cooper.

Lead Presenter.  "An explanation for the surface area of continents versus oceans."  AGU Fall Meeting, San Francisco.  (Dec 8-12, 2003) With L.-N. Moresi, A.M. Jellinek, and M. Manga.

"Coupling the volcanic and atmospheric evolution of Earth and Venus to their long-term tectonic state."  AGU Fall Meeting, .  (Dec 2008) With O'Neill, C.

Lead Presenter.  "The longevity and stability of cratonic lithosphere: insights from numerical simulations of coupled mantle convection and continental tectonics."  American Geophysical Unioun Fall Meeting, San Francisco, CA.  (Dec. 2002) With L. Moresi.

"Towards a physical understanding of the effects of depth-dependent rheology on mantle convection."  AGU Fall Meeting, San Francisco.  (Dec 8-12, 2003) With Richards, M.A., S. Morris, and F. Busse.

Co-Author.  "The creation of cratonic lithosphere by thrust stacking: constraints on proto-cratonic lithosphere from seismology, geodynamics, and geochemistry."  AGU fall meeting, San Francisco.  (2005) With Cooper, C.M., A. Levander, and L.-N. Moresi.

"Forty-Sixty and The Earth's Heat Loss."  Columbia University, .

Co-Author.  "Water delivery by subducting slabs: does flat mean more ?."  GSA annual meeting, Denver.  (2005) With Sommer, H., C. O'Neill, and C.A. Lee.

Co-Author.  "Effects of the asthenosphere on mantle convection."  Mantle Convection Workshop, Boulder.  (2005) With Richards, M.A., and F. Busse.

Lead Author and Presenter.  "Continental growth, the archean paradox, and the global heat flow paradox."  AGU spring meeting, Montreal.  (May 2004) With L.-N. Moresi, A.M. Jellinek, and M. Manga.

"Forty-Sixty and The Earth's Heat Loss."  Harvard University, .

Co-Author.  "Transition metal evidence for coherent sections of recycled oceanic lithosphere in hotspot source regions: implications for the origins of hotspot magmatism."  AGU spring meeting, New Orleans.  (2005) With Lee, C.A., and Z.A. Li.

"Forty-Sixty and The Earth's Heat Loss."  University of Texas, .

Co-Author.  "Growth of crustal units on Mars and Earth: effects of depletion and insulation."  AGU spring meeting, New Orleans.  (2005) With O'Neill, C., and L.-N. Moresi.

Co-Author.  "Broad constraints on continental rheology from coupled thermal-mechanical models of crust, lithosphere and mantle."  AGU spring meeting, Montreal.  (May 2004) With Moresi, L.-N.

Sole Author and Presenter.  "Demonstrations in Earth Science Curriculum and Answering the Question of What Do Earth Science Professors Do With Their Time."  Houston Independent School District Teacher Training Seminar, Houston.  (July 2004)

Sole Author and Presenter.  "Forty-Sixty and the Earth's Heat Loss."  Scripps Institute of Oceanography, IGPP Departmental Seminar, San Diego.  (April 2004)

Sole Author and Presenter.  "Popoular Music and Culture in the 1980's."  University of Houston, World Music Class, Quest Lecturer, Houston.  (May 2004)

"Making, Keeping, and Maybe Even Losing Ancient Continental Lithosphere,."  Goldschmidt Conference, .

"The stressful birth, long boring life, and liquid induced demise of cratonic lithosphere."  Gordon Research Conference on the Interior of the Earth, .

Lead Author and Presenter.  "Cooling the Earth."  Gordon Research Conference on the Interior of the Earth, Boston.  (2005)

Lead Author and Presenter.  "The Cooling Efficiency of Thermal Convection: Counterintuative Examples with Application to the Solid Earth."  Australian Institute of Physics, 16th National Congress, Canberra.  (2005)

Lead Author and Presenter.  "Continental insulation, mantle cooling, and the surface area of oceans and continents."  AGU fall meeting, San Francisco.  (Dec 2004) With L.-N. Moresi, A.M. Jellinek, and M. Manga.

"Earth's evolving stress state and the fate of continental cratons: everything falls apart."  AGU fall meeting, .

Co-Author.  "Is water an important parameter in understanding the chemical and geodynamic evolution of the mantle."  AGU fall meeting, San Francisco.  (Dec 2004) With Lee, C.A. and Z.A. Li.

"Water contents in mantle xenoliths from the Colorado Plateau and vicinity: implications for hydration-induced lithospheric thinning."  AGU fall meeting, . With Li, Z. A., C.-T. Lee, A.H. Peslier, S.J. Mackwell.

Co-Author.  "Effects of a low viscosity zone on plate tectonics and mantle convection in the terrestrial planets: a physical theory and numerical experiments."  AGU fall meeting, San Francisco.  (Dec 2004) With Richards, M.A. and F. Busse.

"Poiseuille-Couette flow in low-viscosity asthenopshere."  AGU Fall Meeting, .  (Dec 2008) With Hoink, T.

"Recycling of mafic lithologies during continent formation."  AGU fall meeting, . With Lee, C.-T. A., T. Hoink, P. Luffi, and D.L. Anderson.

"Paleo-Viscometry of magma bodies."  GSA annual meeting, .  (2008) With Hoink, T., C.T. Lee, J.C. Hawthorne.

Co-Author.  "Recycling the lid: the influence of subduction and stirring on convection in a fluid with temperature-dependent viscosity with applications to planetary mantle convection."  AGU fall meeting, San Francisco.  (Dec 2004) With Thayalan, V., and A.M. Jellinek.

"The goldilocks problem of making cratons."  AGU fall meeting, . With Lee, C.A., P. Luffi, T. Hoink, Z.A. Li.

"Connecting top to bottom: the relationship between tectonic plates and mantle plumes."  AGU spring meeting, . With A.M. Jellinek, C.M.I. Robin, and V. Thayalan.

Lead Author and Presenter.  "Depth-dependent rheology and the wavelength of mantle convection with application to Mars."  Workshop on the Martian Hemispheric Dichotomy, Houston.  (Sept 2004) With M.A. Richards, F.H. Busse, and S.J.S. Morris.

"Episodic precambriam subduction."  AGU spring meeting, . With O'Neill, C, L.-N. Moresi, T. Torsvik, and C.A. Lee.

Co-Author.  "The role of chemical boundary layers in regulating the thermal thickness of continents and oceans."  GSA annual meeting, Denver.  (Nov 2004) With Lee, C.A., C.M. Cooper, Niu, F., and A. Levander.

"Modeling coupled mantle convection and continental tectonics."  AGU spring meeting, . With Moresi, L.-N., H. Mulhaus.

Lead Author and Presenter.  "The effects of the hemispheric dichotomy on the thermal and magmatic history of Mars."  AGU spring meeting, Montreal.  (May 2004) With M. Collier, F. Nimmo, and L.-N. Moresi.

Co-Author.  "Seismic constraints on the depth and composition of the mantle keel beneath the kaapvaal craton."  AGU spring meeting, Montreal.  (May 2004) With Niu, F., A. Levander, C.M. Cooper, C.A., Lee, and D.E. James.

Co-Author.  "Crustal thickening above a convecting mantle with application to venus and mars."  Lun. Plan. Sci. Conference, 35, Houston.  (March 2004) With Cooper, C.M., L.-N. Moresi, and F. Nimmo.

Co-Author.  "A curious coincidence between theoretically optimal insulation and the areal extent of continents on the Earth."  White Conference on Planetary Timescales, Canberra, Australia.  (Feb 2004) With Moresi, L.-N., A.M. Jellinek, and M. Manga.

"The essence of a craton."  American Geophysical Union Chapman Conference on Exploration Geodynamics, Perth, Australia.  (September 2001) With L.-N. Moresi and H. Muhlhaus.

"The essence of a craton: is it deep or is it shallow."  American Geophysical Union 2000 Fall Meeting, San Francisco, CA.  (December 2000) With L.-N. Moresi, H. Muhlhaus.

"The role of mobile belts for the longevity of deep cratonic lithosphere: the crumple zone model."  American Geophysical Union 1999 Fall Meeting, San Francisco, CA.  (December 1999) With L.-N. Moresi and H. Muhlhaus.

"Cratons, continental keels, and a convecting mantle."  Scripps Institute of Oceanography, IGPP Departmental Seminar, Scripps Institute of Oceanography, San Diego, CA.  (March 2000)

"The essence of a craton."  University of Houston, Department of Geosciences Departmental Seminar, Houston, TX.  (November 2001)

"Toward fully self-consistent modeling of average continental geotherms."  American Geophysical Union 1999 Fall Meeting, San Francisco, CA.  (December 1999) With L.-N. Moresi.

"Cratons, continental keels, and a convecting mantle."  Texas A&M University, Department of Geology and Geophysics Departmental Seminar, Texas A&M University, College Station, TX.  (September 2000)

"Deep Earth structure, mantle convection, and USArray."  USArray Workshop, Albuquerque, NM.  (March 1999) With M. Gurnis.

"Incorporating continents into a theory of the earth's heat loss."  American Geophysical Union 2001 Fall Meeting, San Francisco CA.  (December 2001) With C.M. Cooper and L.-N. Moresi.

"Cratons, continental keels, and a convecting mantle."  Dalhousie University, Department of Oceanography Departmental Seminar, Dalhousie University, Halifax, Canada.  (October 2000)

"What makes a craton a craton."  American Geophysical Union 2001 Fall Meeting, San Francisco, CA.  (December 2001) With L.-N. Moresi and H. Muhlhaus.

"Coupled mantle convection and crustal deformation/continental tectonics: from venus to earth and back again."  Amercian Geophysical Union 2000 Fall Meeting, San Francisco, CA.  (December 2000) With L.-N. Moresi, H. Muhlhaus.

"The thermal structure of continents: a self-consistent modeling approach."  American Geophysical Union Chapman Conference on Exploration Geodynamics, Perth, Australia.  (September 2001) With C.M. Cooper, L.-N. Moresi, and H. Muhlhaus.

"The feedback between planetary evolution, melt production and tectonic regimes."  AGU Fall Meeting, San Francisco.  (Dec 8-12, 2003) With Collier, M., C. O'Neill, and L.-N. Moresi.

Lead Author.  "A Potential strong connection between climate change and the solid body dynamics of terrestrial planets."  AGU fall meeting, San Francisco.  (2005) With A.M. Jellinek, and L.-N. Moresi.

"The art and science of demonstrating deep time."  AGU, fall meeting, .

Lead Presenter.  "Heat flow scaling for mantle convection with continents and preliminary application to continental growth."  American Geophysical Union Fall Meeting, San Francisco, CA.  (Dec. 2002) With L. Moresi.

"Mantle convection, plate tectonics, and the asthenosphere: a bootstrap model of the earth's internal dynamics."  AGU Fall Meeting, .  (Dec 2008) With T. Hoink.

Sole Author.  "Pulling People into your Poster with a Little Provocation: An Example Using The Cooling Efficiency of Thermal Convection."  AGU fall meeting, San Francisco.  (Dec 2004)

"The effects of volatile cycling on planetary thermal evolution."  AGU fall meeting, . With Sandu, C.

"The geodynamics of super-sized earths."  AGU fall meeting, . With O'Neill, C.

Lead author.  "The kitchen sink and the professors drawer."  AGU fall meeting, San Francisco.  (2005)

Co-Author.  "Thrust stacking and the creation and preservation of cratonic lithosphere."  AGU fall meeting, San Francisco.  (Dec 2004) With Cooper, C.M. and L.-N. Moresi.

Co-Author .  "Cratons are from Earth, tessera are from Venus."  AGU fall meeting, San Francisco.  (Dec 2004) With Cooper, C.M. and L.-N. Moresi.

"Influence of rheology on the lengthscale of mantle convection."  AGU fall meeting suppl, . With Hoink, T.

Co-Author.  "The asthenosphere and the horizontal length-scale of mantle convection."  AGU fall meeting, San Francisco.  (2005) With Richards, M.A., and F. Busse.

Co-Presenter.  "The thermal structure of stable continental lithosphere within a dynamic mantle."  American Geophysical Unioun Fall Meeting, San Francisco, CA.  (Dec. 2002) With C.M. Cooper, L. Moresi.

"Volatile cycling and planetary evolution."  AGU Fall Meeting, .  (Dec 2008) With Sandu, C.

"Low-viscosity channels and the stability of long wavelength convection."  AGU Fall Meeting, .  (Dec 2008) With Ahmed, O.

Co-Author.  "Episodic precambriam subduction."  AGU fall meeting, San Francisco.  (2005 ) With O'Neill, C., L.-N. Moresi, T. Torsvik, and C.A. Lee.

"Climate change and the mode of mantle convection on venus."  Chapman Conference on Exploring Venus as a Terrestrial Planet, . With A.M. Jellinek, and L.-N. Moresi.

Co-Author.  "The conditions for plate tectonics: what went wrong everywhere else."  AGU fall meeting, San Francisco.  (2005) With Jellinek, A.M., and C. O'Neill.

"The effects of volatile content of the mantle on planetary thermal evolution."  GSA annual meeting, .  (2008) With Sandu, C.

Co-Author.  "On the possible role of chemical boundary layers in regulating the thermal thickness of continents and oceans."  AGU spring meeting, Montreal.  (May 2004) With Lee, C.A., C.M. Cooper, Niu, F., and A. Levander.

Lead Author.  "Growth of the hemispheric dichotomy and the cessation of plate tectonics on mars."  Lun. Plan. Sci. Conferenece, 35, Houston.  (March 2004) With M. Collier, F. Nimmo, and L.-N. Moresi.

Lead Author.  "Growth of the hemispheric dichotomy and the cessation of plate tectonics on mars."  White Conference on Planetary Timescales, Canberra, Australia.  (Feb 2004) With F. Nimmo, and L.-N. Moresi.

"The potential of a climate change induced transition in the global tectonic style of a terrestrial planet."  AGU, fall meeting, . With A.M. Jellinek, and L.-N. Moresi.

"The effect of continental growth on the thermal evolution of the Earth."  AGU, fall meeting, . With Woods, S.

"Effects of continental insulation and the partioning of heat producing elements on the Earth's heat loss."  AGU, fall meeting, . With Cooper, C.M., and L.-N. Moresi.

"Remnant iron oxide/sulfide mattes from a Hadean magma ocean at the core-mantle boundary: insights from a small scale post-Archean analog."  Goldschmidt Conference, . With Lee, C.A., N. Thiagarajan, A. Agranier, C.J. O'Neill, and Q.-Z. Yin.

"Episodic precambriam subduction."  Goldschmidt Conference, . With O'Neill, C., L.-N. Moresi, T. Torsvik, and C.A. Lee.

"Forty-Sixty and The Earth's Heat Loss."  University of Minnesota, .

Presenter.  "Forty-Sixty and The Earth's Heat Loss."  University of British Columbia Earth and Ocean Sciences Departmental Seminar, .  (2005)

Presenter.  "Channeling The Mantle: The Effects of Depth-Dependent Viscosity on The Wavelength of Thermal Convection."  Stanford University Department of Geophysics Seminar, .  (2005)

Presenter.  "Forty-Sixty and The Earth's Heat Loss."  Stanford University Departments of Geology and Geophysics Joint Seminar, .  (2005)

Editorial Positions

Associate Editor, JGR-Solid Earth.  AGU.  (Oct., 1999-Present).

Theses

Jimmy Jones, Masters.  "To Be Determined."  (1999).

Kartik Mutnuri, M.S.  "Diffuse Oceanic Plate Boundaries: Kinematic Observations and Dynamic Constraints."  (2005).(Committee Member)

Alexander Ray Simms, Ph.D.  "Late Quaternary/Holocene Evolution of the Nueces Incised Valley, Central Texas."  (2005).(Committee Member)

Catherine Cooper, Ph.D.  "The Thermal and Mechanical Structure of Stable Continental Lithosphere within a Dynamic Mantle."  (2005).(Thesis or Dissertation Director)

Jared Lewis, "Member, Thesis Committee."  

Saijin Huang, "Member, Thesis Committee."  

Fuchon Gao, "Member, Thesis Committee."  

Diana Dana, "Member, Thesis Committee."  

Peng Shen, "Member, Thesis Committee."  

Positions Held

Advisor, Children's Museum of Houston.  (2006 - Present).

Steering Committee Member, NASA.  (2006 - Present).