Mark A. Tidswell, MD, is a Professor of Medicine at UMASS Chan Medical School – Baystate. Trained asa pulmonary and critical care physician, his clinical practice is adult critical care and neurocritical care at Baystate Medical Center in Springfield, MA. He began work in multi-center clinical trials 25 years ago. He was an active contributor to the NHLBI research networks ARDSnet and PETAL from 2000 – 2024, which studied thousands of patients with ARDS, sepsis, and COVID-19. He serves as site PI for pharmaceutical trials in the area of sepsis and ARDS and has 20 years of experience using the Endotoxin Activity Assay to identify endotoxemia in patients in clinical trials. Dr. Tidswell was an investigator in the EUPHRATES trial and is part of the scientific steering committee for the TIGRIS study. He is a co-author and contributor to more than 90 publications.