Greg Balco is a specialist in applications of noble gas and cosmogenic-nuclide geochemistry to Earth surface processes research. This includes both basic research into physical and chemical aspects of these methods and applied research in fields ranging from Antarctic ice sheet change to paleoseismology. Balco has particular expertise in applications of cosmogenic-nuclide geochemistry to Antarctic ice sheet change research, including participation in 11 field expeditions to remote parts of Antarctica as well as close involvement in the development and use of subglacial bedrock recovery drilling systems aimed at determining whether or not ice sheets were smaller during past periods of warm climate. Balco also developed and manages much of the computational and data management infrastructure used for synoptic application of exposure-age data to applications such as paleoclimate and glacier change.