Rob Larter is a marine geophysicist at British Antarctic Survey. Since 2004, his main research focus has been on late Quaternary ice sheet history, glacial geomorphology and glacial/glacial-marine processes. He also remains active in research on the tectonic and palaeoenvironmental history of Antarctica and the Southern Ocean through the Cenozoic era. Larter's specialties include the acquisition, processing and interpretation of seismic reflection, marine magnetic, swath bathymetry, and sidescan sonar data.

Larter began his ITGC work as a lead principal investigator on the THOR project. He and his team will investigate sediments deposited in the seas near the Thwaites Glacier, and reconstruct past changes in environmental conditions and the glacier's response, adding context to projections of future change.

As of spring 2022, Larter is a co-principal investigator on THOR and has assumed the UK lead PI role for the Science Coordination Office, joining Ted Scambos of the US.

Karen Heywood is a professor in the School of Environmental Sciences, University of East Anglia. As an observational oceanographer, she relies on multiple methods to understand Earth's oceans, including ocean-ice interaction in the Antarctic. Her observational tools include research cruises, numerical models, satellite data, among others. She is also enthused by new opportunities offered by ocean gliders and autonomous robots that can take measurements in places that are otherwise too difficult.

Heywood is a lead Principal Investigator on the TARSAN project. She and her team will measure ocean circulation and thinning beneath the Thwaites Glacier. The team will employ automated underwater vehicles and automated land-ice stations.

Erin Pettit is an associate professor at the College of Earth, Ocean, and Atmospheric Sciences at Oregon State University. She is also a National Geographic emerging explorer applying acoustic research with hydrophones to calving and melting glaciers reaching the ocean, to examine ice shelf disintegration and the ice-ocean boundary. Her research on glacier noise includes studying its effects on marine animals. She has presented at TEDWomen on listening to glaciers, and has created the Girls on Ice program to teach high school girls about glaciology, ecology, and mountaineering.

Pettit is a lead Principal Investigator on the TARSAN project. She and her team will measure ocean circulation and thinning beneath the Thwaites Glacier. The team will employ automated underwater vehicles and automated land-ice stations.

David Holland is a professor of mathematics and atmosphere/ocean science at the Courant Institute of Mathematical Sciences at New York University, director of the Environmental Fluid Dynamics Laboratory (EFDL) in New York City, and director of the Center for Sea Level Change at New York University Abu Dhabi. He studies phenomena relating to the Polar Regions and their impacts on global climate. Holland's current research focuses on the computer modeling of the interaction of the Earth's ice sheets with ocean waters, and the acquisition and implementation of observational data for model improvements.

Holland is a lead Principal Investigator on the MELT project. He and his team will measure the melting at the glacier's ice-ocean interface, to understand the processes involved and its potential for triggering increased sea-level rise.

Keith Nicholls is a research scientist at the British Antarctic Survey. He specializes in polar physical oceanography, and has focused his research especially on the Weddell, Bellingshausen, and Amundsen Seas. He has also has contributed to the development of the ApRES (Autonomous phase-sensitive Radio Echo Sounder) instrument.

As a lead Principal Investigator on the MELT project, Nicholls and his team will use a variety of techniques to monitor the ice above and below the grounding line, which is the point where a glacier floats on the ocean, on the Thwaites Glacier.

Poul Christofferson is a glaciologist at the University of Cambridge. His research focuses on ice sheet dynamics, specifically ice sheet interactions with the atmosphere and oceans. His research spans scales, from whole glaciers and ice sheets to micro-scale studies of processes observable in a borehole. Part of his research group develops observational understanding of Earth's glaciated environment using autonomous drones and radar systems, seismology, and records from boreholes drilled to the base of fast-flowing glaciers. Another part of his research group integrates those observations as constraints for numerical models, thereby improving the models.

Christofferson is a lead principal investigator on the TIME project. He and his team will use a variety of techniques, such as radar and seismic analysis, to understand the margins of the Thwaites Glacier, investigating what controls its width and speed.

Slawek Tulaczyk is a Professor of Earth Science at the University of California Santa Cruz. He focuses his research on ice sheets and glaciers as dynamic features interacting with geologic, hydrologic, and climatic processes on different timescales. To understand Thwaites Glacier's potential future contribution to sea level rise, he investigates the physical controls on ice flow velocity and constructs quantitative models of ice flow dynamics, including underlying geology. Tulaczyk explores geologic controls on glacier movement through sedimentological and geochemical analysis of subglacial sediment samples from West Antarctica. He uses multiple data sources—remote sensing, borehole experiments, subglacial sediment samples—to constrain the physics of the subglacial environment and its role in controlling ice flow velocities.

Tulaczyk is a lead principal investigator on the TIME project. He and his team will use a variety of techniques, such as radar and seismic analysis, to understand the margins of the Thwaites Glacier, investigating what controls its width and speed.

Sridhar Anandakrishnan is a professor in the Department of Geosciences at Penn State University. His research interests include reflection seismology, glaciology, and geophysics.

Anandakrishnan is a lead Principal Investigator on the GHOST project. He will travel to Antarctic to use seismic and radar methods on the ice to investigate and quantify the sediment, hydrology, and bedrock underlying Thwaites Glacier.

Anandakrishnan is also a co-investigator on the MELT project.

Andy Smith is head of the Ice Sheet Stability Programme at the British Antarctic Survey. His main research interests are in ice sheets and glaciers, and their role in the Earth system. He is particularly interested in fast glacier flow and subglacial conditions, as well as ice mass balance and ice sheet history.

Smith is a lead Principal Investigator on the GHOST project. He will travel to Antarctic to use seismic and radar methods on the ice to investigate and quantify the sediment, hydrology, and bedrock underlying Thwaites Glacier.

Andy retired from BAS in March 2023 and Alex Brisbourne has taken on the PI role for the UK side of GHOST.