(1990-92) "Rhenium-osmium isotopic investigations of meteorites". ($75,000) NASA, June 1990-June 1992. Principal Investigator.
(1992-1994) "Rhenium-osmium isotopic investigations of meteorites". ($131,950) NASA, August 1992-July 1994. Principal Investigator.
(1991-1992) "Acquisition of a thermal ionization mass spectrometer". ($225,000 matching funds), NSF. Principal Investigator w/ Prof. E.J. Krogstad.
(1992-1994) "Re-Os isotope investigations of ultramafic rocks". ($80,000 ) NSF. January 1992-June 1994. Principal Investigator.
(1994-1996) "Re-Os isotopic investigations of mantle-derived systems". ($110,000) NSF March 1994-February 1996. Principal Investigator.
(1994-1997) "Technical support for the Isotope Geochemistry Laboratory" ($110,000) NSF, March 1994-February 1997). Principal Investigator w/ Prof. E.J. Krogstad.
(1994-1996) "Rhenium-osmium isotopic investigations of meteorites". ($127,000) NASA, August 1994-July 1996. Principal Investigator.
(1994-1995) "Lithium isotope investigations of magmatic and environmental systems" ($24,865) NSF, March 1994-February 1995. Principal Investigator with Prof. E.J. Krogstad.
(1995) "Student support for the 3rd International Hutton Symposium" ($3000) NSF, May 1995-April 1996.
(1996-1998) "Geochemical and isotopic investigations of meteorites". ($128,000) NASA, August 1996-July 1998. Principal Investigator.
(1996-1998) "Re-Os isotopic investigations of mantle-derived systems". ($110,000) NSF March 1996-February 1998. Principal Investigator.
(1996-1997) "Collaborative research of the 190Pt-186Os system as a test of core-mantle interaction". ($70,000) NSF, July 1996-June 1997. Principal Investigator.
(1997-2000) "Lithium Isotopic Investigations of Magmatic and Hydrothermal Systems". ($118,000) NSF, June 1997-May 2000. Principal Investigator with P.A. Candela.
(1997-1999) "Technical support for the Isotope Geochemistry Laboratory: Phase II". ($100,000) NSF, October 1997-Sept. 1999. Principal Investigator with C. Gallup.
(1997-1998) "Collaborative research of the 190Pt-186Os system as a test of core-mantle interaction". ($70,000) NSF, July 1997-June 1998. Principal Investigator.
(1998-2000) "Rhenium-Osmium isotope study of the mantle". ($130,000) NSF, March 1998-February 2000. Principal Investigator.
(1998-2001) "Isotopic and Geochemical studies of meteorites". ($200,000) NASA. August 1998-July 2001. Principal Investigator
(1998-2000) "187Re/187Os, 190Pt/186Os, 34S/32S isotopic systematics of the subcontinental mantle of the western US".($144,000) September 1998-August 2000. NSF, Principal Investigator with A. Brandon.
(1998-2000) "Collaborative research of the 190Pt-186Os system as a test of core-mantle interaction: phase III". ($222,000) NSF, July 1998-June 2000. Principal Investigator with J. Morgan.
(1998-1999) "Acquisition of a state of the art electron microprobe microanalyzer". ($195,000 total). NSF, PI- P. Piccoli, Co-investigator with M. Brown and P. Candela.
(1999-2000) "Acquisition of a state-of-the-art multi-collector inductively-couple plasma mass spectrometer". ($350,000 total). NSF.
(2000-2003) "Accomplishment Based Renewal-Re-Os isotope study of the mantle". ($236,257) NSF.
(2000-2001) "A Rhenium-Osmium study of alkaline basalts from Vesteris seamount and the Jan Mayen area in the North Atlantic" ($77,715) NSF. With Co-I H. Becker.
(2000-2002) "CSEDI: Collaborative Geochemical Research on the Deep Mantle" ($190,000) NSF, July 2000-June 2002. Principal Investigator.
(2001-2004) "Isotopic and Geochemical studies of meteorites". NASA. ($235,000). Principal Investigator.
(2001-2003) "186Os Investigations into the Origins of Osmium in Seawater". NSF-OCE ($148,000) Principal Investigator.
(2002-2004) "Collaborative Research: Characterizing the Late Veneer". NSF-EAR ($175,657) Principal Investigator, with Co-I H. Becker.
(2004-2007) "CSEDI: Collaborative research: Development of geochemical tests for detection of core-mantle interaction." NSF ($323,423). Principal Investigator.
(2003-2005) "Characterizing eastern North American mantle using Re-Os". NSF ($198,487), co-PI with W. G. Minarik.
(2004-2007) "Rhenium-osmium isotope investigations of the Taitao ophiolite". NSF ($222,817). Principal Investigator.
(2004-2009) "Origin and Evolution of Organics in Planetary Systems". NASA Astrobioligy, ~$75,000/yr (to RJW). Principal Investigator M. Mumma, (Goddard Spaceflight Center) (Walker is one of 20 Co-I's).
(2004-2007) "Isotopic and Geochemical studies of meteorites". NASA. ($300,000). Principal Investigator. (2006) "Acquisition of a State-of-the-Art Thermal Ionization Mass Spectrometer" NSF ($265,000).
(2006) "Acquisition of a State-of-the-Art Thermal Ionization Mass Spectrometer" NASA ($265,000).
(2007-2010) "Isotopic and Geochemical studies of meteorites". NASA. ($390,000). Principal Investigator. (2008) "Acquisition of a High Pressure Asher". NASA ($42,000). Principal Investigator
(2007-2009) "The Timing and Geometry of Lithosphere Removal Beneath the North China Craton". NSF EAR ($200,000) co-PI with R. Rudnick.
(2008-2011) "Collaborative Research: CSEDI--Origin and Evolution of Highly Siderophile Elements in Earth's Mantle". NSF EAR CSEDI ($342,883) Principal Investigator.
(2009-2013) "Impact Processes in the Origin and Evolution of the Moon: New Sample-driven Perspectives", NASA NLSI ($435,000 to RJW). Principal Investigator D. Kring (Lunar & Planetary Institute) (Walker is one of ~10 co-I's).
(2009-2012) "PGE, Re-Os and Lu-Hf isotopic signature of lithosphere removal beneath the North China Craton", NSF EAR ($330,330) co-PI with R.L. Rudnick.
(2010-2014) "Origin and Evolution of Organics in Planetary Systems". NASA Astrobioligy (~$375,000 to RJW). Principal Investigator M. Mumma, (Goddard Spaceflight Center) (Walker is one of ~20 Co-I's).
(2010-2013) "Isotopic and Geochemical Investigations of Early Solar System Materials", NASA, ($495,000). Principal Investigator.
(2011-2014) "Highly Siderophile Elements as Tracers of Mantle-crust Interactions in Subduction Zone Metamorphic Rocks", NSF EAR ($300,027) co-PI with S. Penniston-Dorland.
(2012-2013) "Collaborative Research: CSEDI—Application of siderophile elements to mantle geodynamics". NSF EAR CSEDI ($164,584) Principal Investigator.
(2013-2016) "Isotopic and Geochemical Investigations of Siderophile Elements in the Early Solar System", NASA, ($600,000). Principal Investigator.
(2013-2014) "Acquisition of a State-of-the-Art Thermal Ionization Mass Spectrometer", NSF IF ($325,000). Principal Investigator
(2013-2014) "Acquisition of a State-of-the-Art Thermal Ionization Mass Spectrometer", NASA MPE ($225,000). Principal Investigator
(2013-2016) "Collaborative Research: CSEDI—Application of siderophile elements to early Earth processes and mantle mixing". NSF EAR CSEDI ($370,184) Principal Investigator.
(2013-2018) "Inner Solar System Impact Processes: An Integrated Analysis Using Extraterrestrial Samples, Astronomical Observations, and Modeling", NASA SSERVI, ($262,482 to RJW). Principal Investigator D. Kring (Lunar & Planetary Institute) (Walker is one of ~10 co-I's).
(2014-2017) "Application of Siderophile Elements to the Study of the Chemical Structure and Mixing History of the Oceanic Mantle", NSF EAR ($280,000) Principal Investigator.
(2016-2019) "Siderophile Element Studies of the Formation and Early Evolution of the Solar System", NASA Emerging Worlds ($770,000) Principal Investigator.
(2017-2018) "Acquisition of a State-of-the-Art Multi-Collector Inductively-Coupled Plasma Mass Spectrometer", NASA Planetary Major Equipment ($240,000) Principal Investigator.
(2016-2019) "Tungsten and Ruthenium Isotopic Study of the Chemical Evolution of Earth", NSF EAR ($460,000) Principal Investigator, w/ K. Bermingham and A. Mundl co-I's.
(2017-2018) "Acquisition of a State-of-the-Art Multi-Collector Inductively-Coupled Plasma Mass Spectrometer", NSF Instrumentation and Facilities ($480,000) Principal Investigator.
(2020-2024) "Linking Genetic and Chemical Characteristics of the Early Solar System" NASA Emerging Worlds ($625,268) Principal Investigator.
(2020-2023) "Evaluating links between primordial mantle domains and deep mantle structures using 182W and 3He/4He." NSF EAR ($337,814) Co- PI w/ V. Finlayson.
(2020-2023) "Study of Mass Independent Isotopic Compositions of Ru and Mo in Early Earth Rocks." NSF EAR ($317,425) Principal Investigator.
(2020-2023) "Characterizing Hafnium/Tungsten Ratios in Bulk Chondrites."" NASA Emerging Worlds ($242,588) Principal Investigator.
(2020-2023) "Characterizing the Genetics of Lunar Basin-Forming Impactors Using Ru Isotopes." NASA Emerging Worlds ($337,863) Principal Investigator.
(2021-2024) "Spatiotemporal Variability of Tungsten-182 in the Hawaiian Plume." NSF EAR ($383,720) Principal Investigator, V. Finlayson, Co-PI.
Last Updated January 2023