Jinjian Zheng is a Sr. Principal Scientist at Merck, with a career spanning from June 2003 to the present, providing analytical support for drug product development and commercialization. Previously, Jinjian held various roles at Merck, including Principal Scientist in ACDS-ACT and ACDS-SAS, focusing on analytical support for late-stage drug products and drug substances. Earlier experience includes positions as Associate Principal Scientist and Sr. Scientist at Schering-Plough GQS-AS, emphasizing analytical method development for a variety of dosage forms. Jinjian's academic background includes a Ph.D. in Applied Chemistry from The University of Tokyo and an MS in Analytical Chemistry from Xiamen University. Additional research experience includes postdoctoral positions at Iowa State University and the National Institute of Materials and Chemical Research in Japan.