John Valliere-Douglass is a Senior Director of Analytical Sciences at Pfizer. John received a B.Sc. degree in Biochemistry from Western WA University in 1997 and has worked in the biotechnology industry for 27 years in various roles involving the use of mass spectrometry for antigen discovery and biotherapeutic protein characterization. In 2011, John became the mass spectrometry core group leader at Seagen (now Pfizer) where he built a team of scientists that focused on advancing ADC characterization and providing high-throughput process-analytical support with mass spectrometry. In 2022, John became the head of Analytical Sciences where he continues to oversee release and stability method development and further integration of mass spectrometry into early development and characterization of ADCs. Over the course of his career, John has been involved with the CASSS-MS conference on the organizing committee and as a conference co-chair and has authored or co-authored more than 30 publications covering various aspects of protein, antibody and ADC characterization with mass spectrometry.