We work at the intersection of mechanics, materials, and physics to determine the atomic-scale origins of tribology (friction, wear, adhesion, lubrication) and the connections to the structure, composition, and mechanical properties of materials. We pursue the application of this knowledge to applications such as micro- and nano-mechanical systems (MEMS/NEMS), hard disks, thin film design, micro- and nano-manufacturing, protective coatings, and lubricants. We explore novel materials including ultrahard carbon films, tailored molecular layers, lubricant additives, and 2D materials. We focus on experimental methods including scanning probe microscopy including in situ methods, surface/interface science, and synchrotron radiation techniques, and we collaborate extensively with other groups who pursue theory and atomic-scale modeling efforts.