I use high-pressure-temperature experiments to explore the physical properties and phase stability of materials at extreme conditions. This includes studies of crystal structures, phase stability, elasticity, and deformation behavior. My main tools include both laser-drive and gas-gun dynamic compression coupled with laser interferometry and X-ray probes. These studies provide new insight into the fundamental behavior of materials in extreme environments and are relevant to characterizing the phase stability of materials at conditions of deep planetary interiors as well as understanding natural impacts. Additionally, I use diamond-anvil cells combined with synchrotron X-ray scattering to investigate the crystal structure, lattice dynamics, and spin state of materials under static high-pressure and temperature conditions.