Microbes will be at the heart of the solutions to the world's most pressing problems: food, energy, health, and the environment. Princeton research is therefore heavily focused on microbiology, including studies of viruses, bacteria, and yeast. Princeton microbiology research is highly collaborative and interdisciplinary and combines both theoretical and experimental approaches. Our microbiologists are pioneering the understanding of how individual cells are built, function, and signal, how microbes interact with their hosts, and how microbes interact with one another. This research is leading to a comprehensive understanding of fundamental biological processes, development of novel therapeutics to combat infectious diseases, and the engineering of new resources that are of use to humanity. Princeton microbiology provides a unique and broadly interdisciplinary training environment for undergraduate students, graduate students, and postdoctoral fellows.