My primary research interests are in the physics of the thermosphere and the ionosphere, stratosphere-mesosphere-thermosphere-ionosphere coupling, and space weather. I am especially interested in understanding how the state of the stratosphere and the mesosphere can influence the state of the thermosphere and the ionosphere. I am actively working on the analysis and interpretation of various ground-based and space-based observations, in particular incoherent scatter radars, GNSS receivers, and ionosondes. I am also interested in the development of empirical models that describe the ionosphere and the thermosphere, and often use numerical models to conduct my research.