Rachel Penczykowski

Dr. Rachel Penczykowski is an Assistant Professor of Biology at Washington University studying disease ecology in changing environments. Her NSF CAREER Award supports research on urban plant pathogens, particularly powdery mildew epidemics in urban heat islands. Combining field observations, lab experiments, and mathematical modeling, she examines how climate, biodiversity loss, and urbanization reshape host-parasite interactions.

Her work spans diverse ecosystems—from aquatic Daphnia-parasite systems to terrestrial plant-pathogen networks—revealing how predators, resources, and microclimates indirectly modulate disease spread. Current projects investigate warming impacts on fungal virulence and host resistance evolution in St. Louis-area plant populations.

Dr. Penczykowski leads outreach through the PlantSTEM program, engaging K-12 students in pathogen research. She mentors high schoolers via Tyson Research Center apprenticeships and teaches Disease Ecology, integrating modeling with empirical approaches. Her lab collaborates with the Taylor Geospatial Institute to map urban microclimate-disease linkages.