I completed my BA (Hons) in Geology at Oxford University (1975) and PhD at the University of Manchester (1980). After postdoctoral positions at Arizona State University (1978-81) and the Research School of Earth Sciences, (RSES) the Australian National University (1981-86), I worked at CRA Advanced Technical Development (1986-7) and then joined the new Bayerisches Geoinstitut, University of Bayreuth (1987-94). I returned to RSES at ANU in 1994, becoming Professor (2004) and Distinguished Professor (2012-2021). Currently, I am a Research Professor (0.2 FTE) at the School of Earth, Atmosphere and Environment, Monash University (2021-present).

The origin and evolution of the Earth and the terrestrial planets, studied through the application of physical chemical methods, both experimental and computational

The history of Earth’s mantle told through basaltic magmatism

The thermodynamic properties of minerals and melts

Diffusion, point defects and transport properties of minerals

Trace-element geochemistry in planetary processes

Volatiles in magmas and associated geohazards

Synchrotron mediated X-ray Absorption Spectroscopy of geomaterials

Forschungspreis of the Alexander-von-Humboldt-Stiftung, 2000

Schlumberger Medal, Mineralogical Society of Great Britain and Ireland, 2003

Fellow, Mineralogical Society of America, 2006

Bunsen Medal, European Union of Geosciences, 2007

Fellow, Geochemical Society and the European Association for Geochemistry, 2007

Bowen Medal, American Geophysical Union, 2007

Fellow, Australian Academy of Sciences, 2008

Forschungsaufenthalte, Alexander-von-Humboldt-Stiftung, 2012

Fellow, Royal Society, 2012

Fellow, American Geophysical Union, 2015

Forschungsaufenthalte, Alexander-von-Humboldt-Stiftung, 2018

A. E. Ringwood Medal, Geological Society of Australia, 2023

1. O'Neill, H. St.C., Berry, A. J., Danyushevsky, L. V., Falloon, T. J., Maas, R., and Feig, S. T. (2024). The relationship between iron redox states and H₂O contents in back-arc basin basaltic glasses from the North Fiji Basin. Chemical Geology, 122062.

2. Farmer, N., and O'Neill, H. St.C. (2024). The use of MgO–ZnO ceramics to record pressure and temperature conditions in the piston–cylinder apparatus. European Journal of Mineralogy, 36, 473-489.

3. Gao, Y., O'Neill, H. St.C., and Mavrogenes, J. A. (2024). Garnet versus amphibole: Implications for magmatic differentiation and slab melting. Geology, 52, 125-129.

4. Miller, L. A., Berry, A. J., O'Neill, H. St.C., Wykes, J., Newville, M., and Lanzirotti, T. (2024). The effect of composition, temperature and pressure on the oxidation state and coordination environment of copper in silicate melts. Geochimica et Cosmochimica Acta, 364, 129-147.

5. Farmer, N., and O'Neill, H. St.C. (2023). The miscibility gap between the rock salt and wurtzite phases in the MgO–ZnO binary system to 3.5 GPa. European Journal of Mineralogy, 35, 1051-1071.

6. Li, H., O’Neill, H. St.C., Zhang, L., Bao, X., and Liu, X. (2023). The use of boron nitride to impose reduced redox conditions in experimental petrology. American Mineralogist, 108, 1862-1870.

7. Rogers, A., Flanigan, M., Nebel, O., Nebel-Jacobsen, Y., Wang, X., Arculus, R. J., Miller, L., Smith, I., Mather, B.R., Kendrick, M., and O'Neill, H. St.C. (2023). The isotopic origin of Lord Howe Island reveals secondary mantle plume twinning in the Tasman Sea. Chemical Geology, 622, 121374.

8. Hughes, E. C., Saper, L., Liggins, P., O'Neill, H. St.C., and Stolper, E. M. (2023) The sulfur solubility minimum and maximum in silicate melt. Journal of the Geological Society, https://doi.org/10.1144/jgs2021-125.

9. Jollands, M. C., Bloch, E. M., Van Orman, J. A., Hermann, J. and O'Neill, H. St.C. (2022). Scandium diffusion in forsterite: concentration dependence, inter-site reactions and the effect of trivalent cations on Fe diffusion. Physics of the Earth and Planetary Interiors, 334, 106954.

10. Sossi, P. A., Stotz, I. L., Jacobson, S. A., Morbidelli, A., and O'Neill, H. St.C. (2022). Stochastic accretion of the Earth. Nature Astronomy, 6, 951-960.

11. O'Neill, H. St.C. & Mavrogenes, J. A. (2022). The sulfate capacities of silicate melts. Geochimica et Cosmochimica Acta, 334, 368-382.

12. Miller, L. A., O'Neill, H. St.C., Berry, A. J., and Le Losq, C. (2022). Fractional crystallisation of eclogite during the birth of a Hawaiian Volcano. Nature Communications, 13, 1-8.

13. Chen, J., Fallah-Mehrjardi, A., Specht, A., & O'Neill, H. St.C. (2022). Measurement of minor element distributions in complex copper converting slags using quantitative microanalysis techniques. JOM 74, 185-194.

14. Berry, A. J., Miller, L. A., O'Neill, H. St.C., & Foran, G. J. (2021). The coordination of Cr²⁺ in silicate glasses and implications for mineral-melt fractionation of Cr isotopes. Chemical Geology 586, 120483.

15. Roberts, A. P., Zhao, X., Hu, P., Abrajevitch, A., Chen, Y. H., Harrison, R. J., Heslop,D., Jiang, Z., Li, J.,  Liu, Q., MuxworthyA. R., Oda, H., O'Neill, H. St.C., Pillans, B. J.,  & Sato, T. (2021). Magnetic domain state and anisotropy in hematite (α‐Fe₂O₃) from first‐order reversal curve diagrams. Journal of Geophysical Research: Solid Earth 126, e2021JB023027.

16. O'Neill, H. St.C. & Berry, A. J. (2021). The oxidation state of chromium in basaltic silicate melts. Geochimica et Cosmochimica Acta 306, 304-320.

17. O'Neill, H. St.C. (2021). Comment on" Compositional and temperature effects on sulfur speciation and solubility in silicate melts" by Nash et al.[Earth Planet. Sci. Lett. 507 (2019) 187-198]. Earth and Planetary Science Letters 560, 116843.

18. Berry, A. J., O'Neill, H. St.C. & Foran, G. J. (2021) The effects of temperature and pressure on the oxidation state of chromium in silicate melts. Contributions to Mineralogy and Petrology 176, 1-14.

19. Jollands, M. C., O’Neill, H. St.C, Berry, A. J., Le Losq, C., Rivard, C. & Hermann, J. (2021) A combined Fourier transform infrared and Cr K-edge X-ray absorption near-edge structure study of the substitution and diffusion of H in Cr-doped forsterite. European Journal of Mineralogy, 33, 1–26.

20. Berry, A. J., & O'Neill, H. St.C. (2021). Oxygen content, oxygen fugacity, the oxidation state of iron, and mid‐ocean ridge basalts. Magma Redox Geochemistry, Geophysical Monograph 266, John Wiley & Sons, Inc., pp. 155-163.

21. O'Neill, H. St.C. (2021) The thermodynamic controls on sulfide saturation in silicate melts with application to ocean floor basalts. Magma Redox Geochemistry, Geophysical Monograph 266, John Wiley & Sons, Inc., pp. 177-213.

22. Sossi, P. A., Burnham, A. D., Badro, J., Lanzirotti, A., Newville, M., & O’Neill, H. St.C. (2020). Redox state of Earth’s magma ocean and its Venus-like early atmosphere. Science Advances, 6, eabd1387.

23. Chen, J., Mallmann, G., Zhukova, I., & O’Neill, H. St.C (2020). Development of PGE-Bearing Silicate Glass Standards for Quantitative Trace Element Analysis in Silicate-Based Metallurgical Slags. Journal of Sustainable Metallurgy, 6, 691-699.

24. Sievwright, R. H., O'Neill, H. St.C., J Tolley, J.,  Wilkinson, J. J. & Berry, A. J. (2020) Diffusion and partition coefficients of minor and trace elements in magnetite as a function of oxygen fugacity at 1150 ºC. Contributions to Mineralogy and Petrology, 175, 40.

25. Jollands, M. C., Zhukova, I., O'Neill, H. St.C., & Hermann, J. (2020). Mg diffusion in forsterite from 1250–1600° C. American Mineralogist: Journal of Earth and Planetary Materials, 105, 525-537.

26. O’Neill, C., O'Neill, H. St.C., & Jellinek, A. M. (2020). On the distribution and variation of radioactive heat producing elements within meteorites, the Earth, and planets. Space Science Reviews, 216, 1-27.

27. Mare, E. R., O'Neill, H. St.C., Berry, A. J., & Glover, C. J. (2020). The stability of divalent Ge in silicate melts and its geochemical properties. Chemical Geology, 532, 119306.

28. Burnham, A. D., & O'Neill, H. St.C. (2020). Mineral–melt partition coefficients and the problem of multiple substitution mechanisms: insights from the rare earths in forsterite and protoenstatite. Contributions to Mineralogy and Petrology, 175, 7.

[Full publication list available at Google Scholar: http://scholar.google.com.au/citations?hl=en&user=ikrL8TUAAAAJ]