The goal of my research is to understand the evolution of the continents from top to bottom, from the Hadean to the present, and on a range of spatial scales (see figures below). The formation of the continents is the only chemical differentiation process to span nearly all of Earth history and to record, in its rock record, changes in geodynamic and magmatic processes over time. A recurring theme has been the demonstration that ancient episodes of magmatism and crust formation operated differently from those operating today. This broad topic which leaves the latitude to study continental volcanic rocks, subduction zone mechanisms for new crust creation, mantle evolution -especially changes related to continental crust creation, continental rifting, and the deep mantle keels to the continents. The latter subject has led to recent focus on the age and petrogenesis of diamonds. Diamonds bring up the deepest, oldest, and most pristine mineral inclusions from the mantle that are known on Earth. The chief tools for this research are radiogenic isotope systems such as Re-Os, Sm-Nd, and Pb-Pb and trace elements such as the highly siderophile elements (HSE) and the large ion lithophile elements (LILE).