Understanding how rocks deform and how fluids influence (brittle) deformation processes is fundamental to predicting fault behaviour, optimising subsurface energy storage, and mitigating geological hazards. My research addresses these questions by integrating 4D synchrotron X-ray micro-computed tomography with statistical analysis, machine learning, and numerical modelling. I combine laboratory experiments, field observations, and theoretical analysis to test physical theory against observations, with a particular focus on strain localisation mechanisms and the evolution of fault and fracture networks. I have accumulated over 60 days of beam time at synchrotron facilities including ESRF, Swiss Light Source, SOLEIL, and Diamond. I develop open-source analytical tools for the geoscience community, including codes for wavelet analysis and the statistical analysis, permeability, and connectivity suites within the FracPaQ toolbox. I am an Associated Editor for τekτonika.