Constantine Kreatsoulas, Ph.D., joined Circle from GlaxoSmithKline (GSK) where he was the Head of US Molecular Design and Interim Head of Computational Toxicology. His responsibilities at GSK included leading structure-based drug design (SBDD) teams as well as the development of informatics tools for quantitative experimental data analytics and drug hazard identification. Previous to his time at GSK, Dr. Kreatsoulas was a Research Fellow at Merck & Co., Inc., where he focused on SBDD, molecular modeling, machine learning, and small molecule safety assessment. While a Postdoctoral Fellow at Bristol-Meyers Squibb, Dr. Kreatsoulas focused on machine learning in predictive toxicology. Dr. Kreatsoulas was awarded a doctorate in Chemistry from Princeton University, holds a Master’s degree in Regulatory Affairs and Quality Assurance from Temple University, and earned his Bachelor’s degree in Mathematics and Chemistry from New York University.