Staff Profile: Andrew D. Warren

Collections Manager

Andy Warren received his B.S. with honors from Cornell University, where he worked on several butterfly projects and initiated formal research on Mexican butterflies. His honors thesis included a revision of a Neotropical skipper genus Eantis. He later conducted his Ph.D. research on the higher-level classification of the skipper butterflies of the world at Oregon State University, graduating in 2006.

Warren grew up in Colorado, collecting butterflies since the age of 4. His interest in butterflies intensified and from 1986 to 1998 he made annual summer collecting trips to Wyoming. He also has collected extensively in Arizona, Idaho, Montana, New Mexico, South Dakota and Utah. In graduate school, Warren collected throughout Oregon as well as in neighboring regions of Washington and California, and in 2005 published a book on the butterfly fauna of Oregon. He has conducted fieldwork in Georgia, Hawaii, Illinois, Nebraska, New York, Oklahoma, Tennessee, Texas, and more recently, Florida. He has made single trips to Alberta and Ontario and more than 40 to Mexico. From 2007 to 2009 Warren lived in Mexico City intermittently while conducting fieldwork in nearly all the Mexican states. His fieldwork on butterflies has also taken him to the Bahamas, Brazil, the Cayman Islands, Colombia, Dominican Republic, Ecuador, England, Jamaica, Kenya and Netherlands Antilles (Curaçao). Warren's fieldwork has primarily involved sampling of adult butterflies for faunal surveys and revisionary studies, targeted searches for undescribed species and life history studies.

The general theme of Warren's research is the biodiversity of the Mexican and Central American butterfly fauna, especially skippers (family Hesperiidae), with a special focus on Mexican fauna. He has published faunal surveys for several Mexican states, as well as descriptions of nearly two-dozen new butterfly species. Another aspect of his research is higher-level phylogenetic studies of skippers, using molecular and morphological data. Warren recently proposed a revised nomenclature for the world's fauna of Hesperiidae, which was published in Systematic Entomology in 2009. He has participated in a number of phylogenetic studies of various groups of nymphalid butterflies, and recently co-authored an article in the Proceedings of the National Academy of Sciences on the physiology of vision in Heliconius butterflies.

Warren is intensely interested in all butterflies of the Americas and encourages anyone interested in Lepidoptera to visit his website,, the world's most comprehensive online collection of butterfly information and images. The Butterflies of America project aims to ultimately illustrate all butterflies of the New World. The website features more than 7,000 species and over 167,000 images provided by more than 300 contributors.

McGuire Center: Andy Warren is the Senior Collections Manager. He maintains the Lepidoptera collections, integrates new material into the curated collection, curates families that require major reorganization, transports and accessions new collections, sends and receives specimen loans and conducts research on butterfly systematics and biodiversity. Warren also oversees and directs five technicians and several volunteers, hosts and assists visitors to the collection and answers inquiries from researchers and the public.