[3] She received a Doctor of Philosophy degree from Duke University in 2001 on coexistence of temperate forest tree species, focusing on the differences among temperate tree species in seed dispersal, seed banking and density-dependent mortality and how those characteristics contribute to maintenance of diversity.
Throughout her career Janneke has focused on the maintenance of species diversity and the impact of global environmental change on plant communities.
Her main approaches include observational studies, manipulative experiments, and statistical modelling.
After her PhD and during her first postdoc, Janneke worked at another LTER site, the Cedar Creek Ecosystem Science Reserve, associated with the University of Minnesota, together with David Tilman.
A program that has been founded in collaboration between the Hille Ris Lambers Lab and Brosi Lab created in 2013 actively engages the public to participate in community science and collect data to better understand the impact of climate change on biodiversity.