Our group advances sustainable biological wastewater treatment by integrating microbial ecology, process engineering, and systems modeling. We focus on microbial nitrogen and phosphorus cycling, with an emphasis on improving nutrient removal performance and stability. Mathematical models and data-informed analyses link microbial population dynamics to process performance to guide design and operation. Additional efforts target energy and resource recovery from waste streams to support circular, climate-resilient water infrastructure. In partnership with utilities, industry, and academic collaborators, fundamental insights are translated into practical solutions for next-generation water resource recovery facilities.