I am a systematic mycologist. My focus is on teaching and learning about the classification, evolution, and characterization of fungi. Fungi are a particularly poorly known group, with only about 5% of species formally described. My focus is in fungal biodiversity, especially of species that are pathogens of insects. I use molecular and morphological approaches to discover their relationships, devise classification systems, and understand factors that have driven their evolution. I direct the Cornell Plant Pathology Herbarium (CUP), a world-class collection that documents the earth`s diversity of fungi and plant disease organisms. I teach undergraduate and graduate classes on fungi.