Susan Marian Ellis (born 1965) is a geophysicist based in New Zealand, who specialises in modelling the geodynamics of the Earth's crust deformation, at different scales.[1] Ellis is a principal scientist at GNS Science[2] and her main interests are in subduction, seismology, tectonics, crust and petrology.[3] Ellis's current work focuses on the influence of faulting on stresses in the crust, and how this is related to geological hazard and the tectonic settings in New Zealand.[1]