Rob Nixon has led and participated in numerous field assignments in Arizona, Nevada, California, and Mexico. He has extensive experience working on projects related to the Mojave Desert tortoise and a variety of rare plant species. In addition, Mr. Nixon has conducted surveys for the following state protected and federally listed species: Pima pineapple cactus, Cochise pincushion cactus, Acuña cactus, Arizona hedgehog cactus, cactus ferruginous pygmy owl, Western burrowing owl, yellow-billed cuckoo, Gila monster, Tucson shovel-nosed snake, Chiricahua leopard frog, and talus snail. Mr. Nixon has experience composing Biological Evaluations and Assessments, conducting native plant inventories, jurisdictional delineations, and exercises involving the description and mapping of vegetation associations and habitat types.