Explore pathogen diversity through an ecological lens in this insightful lecture by Mercedes Pascual, presented at the Santa Fe Institute's Annual Science Board Symposium and Meeting on Complexity: Theory and Practice. Delve into the intricate relationships between pathogens and their environments, examining how ecological factors influence the diversity and evolution of disease-causing organisms. Gain a deeper understanding of the complex dynamics that shape pathogen populations and their impact on ecosystems and human health.