Mark Adrian Kiefer, MDColon & Rectal Surgery in Tulsa, OK

Mark A. Kiefer, MD, is a board-certified, experienced colon cancer specialist and surgeon specializing in colorectal surgery at Ascension St. John in Tulsa, Oklahoma. Dr. Kiefer provides gastrointestinal surgery options to support your digestive health. He uses minimally invasive and robotic-assisted technology. Robotic-assisted surgery may lead to a faster recovery, shorter hospital stay, and less scarring. Schedule a consultation to learn more.

Ask your Ascension St. John primary care provider about whether a colon cancer screening is right for you. If you are diagnosed with cancer, Dr. Kiefer starts by listening to better understand your and your concerns. He is part of Ascension St. John Cancer Care and delivers comprehensive surgical care and follow-up. Our team will connect you with specialists and services you may need.