Dr. John Marshall is a Professor of Medicine and Oncology, the Chief of Hematology and Oncology, and the Director of the Otto J Ruesch Center for the Cure of Gastrointestinal Cancers, at the Lombardi Comprehensive Cancer Center, Georgetown University Medical Center. Dr. Marshall received his training at Duke University, the University of Louisville, and Georgetown University. Dr. Marshall is an internationally recognized expert in new drug development for GI cancer, with expertise in phase I, II, and III trial design, and has served as Principal Investigator for more than one hundred clinical trials. While he has an interest in many areas of cancer research, his primary focus has been on the development of vaccines to treat cancer. Dr. Marshall has become an outspoken advocate for GI cancer patients and the importance of clinical research participation. Most recently, he has established the Otto J Ruesch Center for the Cure of GI Cancers, an organization solely focused on improving the lives of GI cancer patients through innovative research, personalized medicine, and focused advocacy.