This interview was conducted as part of a series documenting the history of scientific work on the West Antarctic Ice Sheet (WAIS). Charles Bentley has been a geophysicist at the University of Wisconsin since 1959. This interview discusses his entry to geophysics and graduate work at Columbia University under Maurice Ewing, and his inclusion by Frank Press in Antarctic traverses associated with the International Geophysical Year. He discusses his discovery with Ned Ostenso of the marine nature of WAIS during this field work, and then the building of the geophysics program at Wisconsin. There is detailed information about the organization and work of the Ross Ice Shelf Geophysical and Glaciological Survey, and the Siple Coast Project, and his group's subsequent field work. He also discusses his interest in the subject of the prospective disintegration of WAIS, and his shift in interest from geophysics to glaciology on account of this problem.