Research interests include numerically simulating cloud systems, with particular emphases on the interactions between large-scale, mesoscale, and cloud-scale processes, as well as between turbulence, mixing, and microphysics in clouds. Research interests also include numerical simulation of atmospheric boundary layers, with foci on cloud-topped boundary layers and on wildfire spread and behavior. Prof. Krueger's research group has developed and uses several different numerical models, including cloud-resolving models, large-eddy simulation models, and one-dimensional turbulence models. These models include the UU LES (University of Utah Large-Eddy Simulation model), the UU-UCLA CRM (University of Utah-UCLA Cloud Resolving Model), the EMPM (Explicit Mixing Parcel Model), ClusColl (Droplet Clustering and Collision model), and SAM (System for Atmospheric Modeling).