My research focuses on the ecology and conservation of birds and mammals, especially marine species. Underlying themes include studies that examine the links between foraging behavior, energy expenditure, at-sea distribution, and predator-prey interactions. This research uses a variety of techniques including isotopic tracers, heart rate loggers, and respirometry to measure energy expenditure, and state of the art electronics like GPS loggers, satellite telemetry, archival geolocation data loggers, and VHF radio tags to study foraging behavior, activity, distribution, and habitat use of free-ranging animals.