Application of U-series disequilibria, radiogenic isotope geochemistry, major- and trace- element geochemistry and the principles of physics and chemistry to a variety of fundamental problems in Earth and planetary sciences, including: accretionary and core-formation history and processes in planets; the origin and evolution of the Earth's mantle and continental crust; the generation and transport of basaltic magma; the development and evolution of volcanic systems; magma degassing; volcanic hazard assessment; radiometric methods for dating igneous and sedimentary rocks; geo-archeology; and, isotope hydrology