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 how this history relates to patterns of tree diversity and diversification. My research is focused in Central America (especially Panama) and the Amazon basin (Ecuador and Brazil). My students have also recently worked broadly in eastern North America.

I am the 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.