- Asa Gray Professor of Systematic Botany
- Curator of the Farlow Herbarium
- Pfister Lab
Systematics and ecology of cup-fungi (Helotiales and Pezizales), lichen taxonomy and biology.
Monographic and phylogenetic studies of the Sarcoscyphineae, anamorphs of the Orbiliaceae, and monographic and developmental studies of members of the Pezizales.