The HPx-eos and THERMOCALC software are developed by an international team of Earth scientists.
The core development team:

Eleanor Green. Eleanor is Senior Lecturer in Computational Petrology at the University of Melbourne. She develops the HPx-eos and their applications, and guides the ongoing expansion of THERMOCALC. She also develops and maintains this website. Send her a message using the contact form (multiple recipients).

Roger Powell. Roger, who also goes by RP, is Emeritus Professor of Earth Sciences at the University of Melbourne. He leads the development of THERMOCALC, and is closely involved in much else to do with the HPx-eos and their applications.

Tim Holland. Tim is Emeritus Professor at the University of Cambridge. He leads the development of the internally-consistent dataset of end-member thermodynamic properties, and other key steps in the development of the HPx-eos and their applications.
Other close collaborators, who develop and test aspects of the modelling:

Johann Diener. Johann is Associate Professor of Metamorphic Petrology at the University of Cape Town. He applies the HPx-eos via THERMOCALC and is involved in their development.

John Mansour. John is a developer of the Underworld geodynamics toolkit, working at the University of Melbourne and Monash University with the support of AuScope. He is working with Eleanor on developments in both THERMOCALC and Underworld, working towards integrated geophysical and geochemical modelling.

Katy and Pudding Evans. Katy and Pudding developed the sulphide and sulphur-bearing end-members in version 6 of the Holland & Powell dataset. Pudding is pictured, while Katy, who is Associate Professor at Curtin University, did most of the actual modelling.

Luca Ziberna. Luca is a Researcher at the University of Trieste. He led the development of the SCOlP and COlP barometers for olivine-bearing igneous rocks, and has an ongoing interest in this field.

Richard White. Richard is Professor of Earth Sciences at the University of St Andrews. He tests and applies the HPx-eos via THERMOCALC.

Simon Schorn. Simon holds a Fellowship at the University of Graz, where he is investigating the effect of fluid infiltration on metamorphism. He is also working with Eleanor on the development of a key HPx-eos for clinopyroxene. Send him a message using the contact form (multiple recipients).