Dr. William “Bill” Grady identifies new ways to prevent, detect and treat colon cancer and other gastrointestinal, or GI, cancers. His research centers on molecular markers of disease, called biomarkers, that are easily accessible in blood or stool samples. A molecular biologist, Dr. Grady identifies biomarkers that eventually could be used in widely available tests to detect cancer early, when it is most treatable, or even identify healthy tissues at high risk of becoming cancerous. With such methods, doctors could tailor cancer prevention tests and therapies to those who need them the most. Dr. Grady is a leader of national research groups in his field. He is also a gastroenterologist who cares for patients with GI cancers and precancers and people with genetic conditions that increase their risk of developing GI cancers.