(1990-1992) "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. Co-PI 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, Principal Investigator.

(2001-2004) "Isotopic and Geochemical studies of meteorites". ($230,000) NASA. Principal Investigator.

(2002-2004) "Collaborative Research: Characterizing the Late Veneer". ($175,657 total). NSF, Principal Investigator (w/ H. Becker as Co-I).

(2004-2009) "Origin and Evolution of Organics in Planetary Systems". NASA Astrobiology, (~$75,000/yr for RJW), M. Mumma, PI ; Goddard Spaceflight Center

(2003-2007) "CSEDI: Collaborative Research: Development of geochemical tests for detection of core-mantle interaction", NSF, ($323,423 total), Principal Investigator.

(2004-2007) "Rhenium-osmium isotope investigations of the Taitao ophiolite", NSF, ($222,817 total), Principal Investigator.

(2004-2007) "Isotopic and Geochemical Investigations of Meteorites", ($300,000 total), NASA, Principal Investigator.

(2003-2005) "Characterizing eastern North American mantle using Re-Os". NSF ($198,487), co-PI with W. G. Minarik.

(2003-2007) "Melt influx and the effects on Os-Sr-Nd isotopic systems and Platinum Group Elements in Jurassic Oceanic Mantle (Totalp Massif, Swiss Alps)". NSF ($137,936), co-PI with H. Becker.

(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 Investigations of Meteorites", ($400,000 total), NASA, Principal Investigator.

(2007-2009) "The timing and geometry of lithosphere removal beneath the North China Craton". NSF ($200,969), co-PI with R.L. 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) "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.

(2009-2013) "Impact Processes in the Origin and Evolution of the Moon: New Sample-driven Perspectives", $435,000 (to RJW). Principal Investigator D. Kring (Lunar & Planetary Institute)(Walker is one of ~10 co-I's).

(2010-2015) "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.

(2013-2015) "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) Principle Investigator.

(2016-2019) “Siderophile Element Studies of the Formation and Early Evolution of the Solar System”, NASA Emerging Worlds ($770,000) Principal Investigator.

(2016-2019) “Tungsten and Ruthenium Isotopic Study of the Chemical Evolution of Earth”, NSF EAR ($460,000) Principal Investigator.

Last Revised June 2017.