My research focuses on the taxonomy and diversity of bees. Currently I am working on creating a list of Minnesota bees. I am focusing on resolving thorny taxonomic questions, such as identifying and delineating difficult species-groups that occur in Minnesota.
My PhD thesis largely focused on two main areas: the taxonomy and systematics of the bee tribe Perditini (Andrenidae) and the evolution of host plant use in bees. I also dabbled in behavior and conservation.