My research interests span broad scales in time and space of the subduction process. Recent imaging and modeling work suggests the interaction of the slab pull force with the background mantle has a significant effect on subduction as slabs fold, stall, or descend unhindered through the mantle transition zone. This change in forces has a conjugate effect on the surface expression of convergence and leads to many of the major structures currently observed. Through seismic imaging, we improve our models of slab geometry in active subduction zones and use those models to infer the history of the subduction process. We are also able to use seismic imaging methods in cratonic environments to explore the effect of subduction in the early Earth, and if/when subduction initiated or if other key processes are involved in the creation of continents in the Archean.