My lab group studies plant evolution, ecology and historical biogeography.  I am particularly interested in the history of neotropical (Central and South American) forests and in factors that drive tropical plant diversification. My research is focused in Central America (especially Panama) and the Amazon basin (Ecuador and Brazil). Some of my students work in Michigan forests.

I am currently Associate Chair of Museum Collections in EEB and Director of the University of Michigan Herbarium and Museum of Zoology. These two museum units contain over 13 million biological specimens. In this role I am actively involved in facilitating collections-based research, stewardship and teaching.