He has obtained triple-board certification in Radiation Oncology (American Board of Radiology), Medical Oncology and Internal Medicine (American Board of Internal Medicine). He is a member of the National Cancer Institute’s Rectal-Anal Cancer Task Force.
Dr. Thomas is author or co-author of over 240 journal articles and is a co-editor of multiple textbooks including Mediastinal Tumors (Springer-Verlag, 1995), Biliary Tract & Gallbladder Cancers: Diagnosis and Therapy (Demos Medical Publishing, 2008), and Esophagus Cancers: Practice and Principles (Demos Medical Publishing, 2009).