I am a theoretical physicist interested in the identification, characterization, and classification of phases and phase transitions of quantum many-body systems. One reason this is a rich and exciting area is that perhaps the most basic question — “What is a quantum phase of matter?” — is not well-understood. That is, the process of discovering new principles and physical properties that distinguish among phases of matter is very much an ongoing one. To address these and related issues, my research employs a variety of theoretical and occasionally computational techniques. Specific areas of current interest include topological phases of matter and states with immobile excitations dubbed fractons.