Dr. Colin Leffert is a board-certified gastroenterologist with advanced procedural expertise including ERCP, EGD, colonoscopy, and PEG placement. Trained at Ascension Macomb-Oakland, and practiced in Detroit, Dr. Leffert brings a strong clinical foundation, a high-volume hospital background, and a collaborative spirit.. Originally from Golden, Colorado, he was eager to return to his home state and contribute his experience and dedication to patient-centered care to our exceptional team at Rocky Mountain Gastroenterology.