She joined the faculty at Michigan State in 1999. Her current research is centered around studying approaches to support students with low mathematical placements in successfully transitioning to general chemistry through a chemistry bridge course. This work led to the collaboration with Kristen Bieda. Posey and Bieda have recently begun a project to explore the nature of mathematical knowledge for teaching in the context of chemistry (MKT-C). She is also interested in the nature of social networks in cohort programs and how they may promote student success.