Dr. Darrel Frost is interested in the evolutionary origin and diversification of amphibians and reptiles. His efforts have resulted in revised classifications of iguanian lizards, as well as a general classification and revision of all amphibians. The latter was based on the largest phylogenetic tree ever calculated for a vertebrate group. Dr. Frost also maintains a large online taxonomic catalogue of the world's living amphibians. He feels strongly that meticulously prepared catalogues help knit the world's scientific community together by providing workers in the developing world with access to current literature on the biodiversity of living amphibians.