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), SAM (System for Atmospheric Modeling), and WRF-SFIRE (Weather Research and Forecasting model, with coupled wildfire spread physics). Prof. Krueger was Chair of GCSS (GEWEX [Global Energy and Water Cycle Experiment] Cloud System Study) from 2001 through 2003. He organized the GCSS-ARM Workshop on the Representation of Cloud Systems in Large-Scale Models which was held 20-24 May 2002 at Kananaskis, Alberta, Canada. He served as chair of GCSS WG 4 (Precipitating Convective Cloud Systems). He was the UCAR Members’ Representative from 1998 to 2012. He served as an Associate Editor for Journal of Advances in Modeling Earth Systems (JAMES) from Jan 2012 to Jan 2016.