Our department supports many different theoretical and computational activities. These range from development of theories and models for chemistry, biochemistry, materials and engineering to development of algorithms and methods that are efficient on many different types of computers to application of models to elucidate physical and chemical properties of many different types of chemical systems. Some of our groups are fully focused on theoretical and computational development and use, while other groups combine both computation and experiment. In either case, all of our groups are highly collaborative and enjoy solving important chemical challenges.