Dr. Hendrickson has focused his research on the evolution, conservation and ecology of freshwater ecosystems, particularly those of North American deserts and generally with emphasis on fishes and Mexico. His most recent and ongoing project focuses on the fishes of Texas (see http://www.fishesoftexas.org). Endangered blind catfishes from Texas and northern Mexico are a recently rejuvenated project following up on work in the 1990s on them in Mexico. We are also very interested in research on American Eels in Texas. Earlier work focused ecology and conservation of the spring ecosystems of Cuatro Cienegas, Coahuila, Mexico, a small Chihuahuan Desert valley with extremely high endemism that was recently declared a National Reserve for Flora and Fauna. Another recent project focused on distribution and evolution of blind catfishes of the genus Prietella, also of northwestern Mexico. He is also working with collaborators on the description of a new catfish family from Chiapas, Mexico and another project in development addresses evolution, ecology and systematics of the mostly still undescribed trouts of the northern Sierra Madre Occidental of Durango, Sinaloa, Chihuahua and Sonora, Mexico.