Roger Liu is a scientist at Bristol Myers Squibb. At BMS, he is responsible for supporting mass spectrometry capabilities in support of bioprocess development and analytical strategies for protein characterization, stability, and impurity profiling. Roger is also leading process analytical efforts for multiple programs. Roger earned his PhD with Dr. Michael L. Gross from Washington University in St. Louis (Missouri, U.S.), focusing on the characterization of protein higher order structures through developing and applying novel mass spectrometry-based approaches, most notably: fast photochemical oxidation of proteins, hydrogen deuterium exchange, and native spray.