To protect the diversity of life on Earth, conservation biologists study species and habitats in danger of extinction. Freshwater is arguably one of the most critical global resources. The ecosystem biodiversity of this invaluable resource is highly threatened. In his role as aquatic conservation biologist, Zeb Hogan travels the world to better understand and reduce threats to endangered freshwater fish and their habitats. Hogan’s efforts support the invaluable freshwater biodiversity and ecosystem health.