Gerardo J. Ceballos

Performed the first global, geographically explicit analysis of a major taxonomic group, evaluating population and species extinctions, and land conservation needs for all mammals. Showed the lack of congruence among hotspots of mammal species richness, endemism, and risk. Studies of prairie dogs illuminated the crucial role of keystone species/ecosystem engineers in grasslands, demonstrating the need to protect them to avoid desertification. Pioneered use of cattle to scientifically restore grasslands. Conducted first experimental study showing species diversity confers protection against infectious diseases. Assessment of tropical dry forest biodiversity and endemism made their preservation of international concern. Quantitative analyses formed the basis for the Mexican Endangered Species Act and led to creation of protected areas covering roughly one million hectares. Leads the most ambitious jaguar research project, providing information on that critically important top predator. Has the longest study on small mammal ecology in the tropics (20 years). Publications include 350 scientific and popular papers and 36 books.