I have a wide range of astrophysical interests and collaborate with a number of theorists and observers in many wavebands. My research centers around extreme types of situations - from dense stellar environments to violent explosions to “ultraluminous” X-ray sources. Much of my interest lies with unpredictable and rare phenomena, with suitable objects of study occurring only once every few months to once every few years.

Globular Cluster Dynamics: the importance of close binaries in a real N-body system

Young Massive Star Clusters: the search for black holes leads to a number of surprises

Gravitational Lens Flux Ratio Anomalies: probing quasar emission regions and small scale structure

Ultraluminous X-ray Sources: intermediate black holes or super-Eddington emission

Core-collapse Supernovae: shock physics, chemical enrichment, and progenitor masses