Glaciers and ice sheets were long believed to be sterile environments, but just like other large ecosystems (e.g., tropical forests, tundra), they are now widely recognized as one of the Earth’s biomes, teeming with life. However, despite their global influence, many of the microbiological processes within the cryosphere remain poorly quantified. The ICEBIO network will foster collaborative research and training to answer key questions about microbial ecology and adaptation in glacial habitats. In all 12 doctoral candidates will work together to advance our understanding of microbial and biogeochemical processes in a range of glacial ecosystems, the exchanges between them and the surrounding ecosystems.