General Interests: plant nomenclature, plant morphology, and plant taxonomy, especially Asteraceae and Poaceae.

Current Projects: International Plant Name Index, HUH Specify lookup tables, and Flora of North America project.

Associated Activities: Nomenclature Editor, Harvard Papers in Botany, Collaborator, Index Nominum Genericorum (Plantarum); Member, Committee for the Vascular Plants, International Association for Plant Taxonomy; Associate Nomenclature Editor, Taxon, International Journal of Plant Taxonomy; Nomenclatural Consultant and Data Contributor to USDA-GRIN database