In this issue of Gastrointestinal Endoscopy Clinics of North America, guest editors Drs. Kenneth J. Chang and Jason B. Samarasena bring their considerable expertise to the topic of The Endoscopic Oncologist. The practice of gastrointestinal endoscopy intersects with oncology in many ways, much of it involving pre-cancerous conditions. But the endoscopist's role in diagnosing, staging, and treating cancer patients is expanding. This issue is devoted to the current and future role of the endoscopic oncologist, with topics such as endoscopic diagnosis of luminal gastrointestinal cancer and extra-luminal cancer; endoscopic resection for early cancer; and more. Contains 12 relevant, practice-oriented topics including endoscopic ultrasound cancer staging; management of biliary obstruction; endoscopic management of colonic obstruction; endoscopic treatment of tumor bleeding; endoscopic ultrasound-guided pain management; and more. Provides in-depth clinical reviews on the endoscopic oncologist, offering actionable insights for clinical practice. Presents the latest information on this timely, focused topic under the leadership of experienced editors in the field. Authors synthesize and distill the latest research and practice guidelines to create clinically significant, topic-based reviews.