Karthik Anantharaman is an Assistant Professor in the Department of Bacteriology at the University of Wisconsin-Madison. He received his Ph.D. in Earth and Environmental Sciences from the University of Michigan in 2014 studying the geomicrobiology of deep-sea hydrothermal plumes. His interdisciplinary research program focuses on understanding the cycling of sulfur and nutrients, with a strong emphasis on the microbial and viral processes that transform them in environmental and human systems. Karthik’s research uses a combination of cultivation-independent, cultivation-dependent, and field-based approaches to investigate the interplay between the microbiome, virome, and chemistry in hydrothermal plumes, oxygen minimum zones, and the deep oceans. On this cruise, he will be deploying a novel high-throughput in-line filtration system to sample and study microorganisms and viruses in the Guaymas Basin water column.