I have broad interests in the fields of volcanism, magmatism, and tectonics. My work in these fields covers several topics that largely fit into two areas. First, I examine the P-T-X-t path of magmas prior to eruption, which I approach using solubility barometers, crystal-melt thermometers, and diffusion chronometers. Second, I investigate the origin and role of volatiles in magmatic systems. My favorite tool is melt inclusions, which provide a unique means for directly measuring the pre-eruptive volatile contents of mama. Central to my work is the chemical and textural analysis of macrocrysts, at both the individual crystal and population scales, and integrating my results with those of other disciplines (e.g., seismology, remote sensing).