Gerardo Ceballos is an ecologist and conservationist working on macro ecology, population and community ecology, endangered species, protected areas, and coupling development and conservation. He is a professor at the Instituto de Ecologia, Universidad Nacional Autonoma de Mexico. Ceballos has published more than 450 scientific and outreach papers and 40 book. His book Annihilation of Nature: Human Extinction of Birds and Mammals will be published in August.