A theoretical chemist is a scientist who uses mathematical models and computer simulations to understand chemical systems and reactions. They focus on predicting the behavior of molecules and materials at the atomic and molecular levels, often without conducting physical experiments. This approach helps in exploring complex chemical phenomena and can lead to new discoveries in fields like materials science and pharmaceuticals. Theoretical chemists often collaborate with experimental chemists to validate their predictions and refine their models. They may work in academia, industry, or government research labs, contributing to advancements in areas such as nanotechnology and biochemistry. Their work is essential for developing new technologies and improving existing processes.