Alex Bradley is an associate professor in the Department of Earth and Planetary Sciences at Washington University in St. Louis. His research combines field and laboratory investigations to examine a wide range of problems in biogeochemistry. He is interested in understanding the principles that govern the function and evolution of microbial ecosystems over the course of Earth’s history. His laboratory explores how biogeochemical information is preserved in sedimentary environments over a wide range of time scales, with a focus on molecular structures and isotopic signatures. Before joining the faculty at Washington University, Alex was a postdoctoral fellow at Harvard University. He received his A.B. in earth and planetary sciences from Harvard University and a Ph.D. in geochemistry from the Massachusetts Institute of Technology.