Parent Page: Academic Departments id: 22555 Active Page: Facultyid:23541


Internal Medicine

William M. Tierney, MD, FASGE, AGAF

Frances K. & H. Malcolm Robinson Chair in Gastroenterology
Chief of Clinical Services, Digestive Diseases and Nutrition
David Ross Boyd Professor of Medicine
Director of Endoscopic Ultrasonography
Fellowship Program Director


COMD 7400
800 Stanton L Young Blvd
Oklahoma City, OK

405-271-5428 (Office)
405-271-5803 (Fax)

Dr. Tierney graduated Summa Cum Laude from Williams College in Williamstown, MA and received his medical degree from Yale University in 1990 and subsequently completed a residency in Internal Medicine at the University of Pennsylvania. He also completed a fellowship in Gastroenterology at the University of Michigan where he received 2 years of dedicated training for EUS and ERCP. He is currently David Ross Boyd Professor of Medicine at the University of Oklahoma and serves as Chief of Clinical Services, Section of Gastroenterology, and Director of the Gastroenterology Fellowship Program. He has received the University of Oklahoma, College of Medicine Gold Humanism Award in Medicine and in 2013 was appointed the David Ross Boyd Professorship. He has served as the Faculty Sponsor, for the OUHSC, College of Medicine, Gold Humanism Honor Society since 2015. In March 2013, Dr. Tierney received the Parker J. Palmer Courage to Teach Award, a national award presented by the ACGME to honor program directors who find innovative ways to teach residents/fellows and to provide quality health care. In 2015, Dr. Tierney became inducted as a member of the OU College of Medicine Academy of Teaching Scholars and received the Dewayne Andrews, M.D. Excellence in Teaching Award.  He ​has been named to the National Database Castle Connelly's Best Doctors and included in the list of Best Doctors in Oklahoma every year from 2008-2020, the Best Gastroenterologist List in Oklahoma Magazine 2007-2020.  He is committed to service and has served on several national committees including the Governing Board for the American Society for Gastrointestinal Endoscopy. He is board certified by the American Board of Internal Medicine in Gastroenterology and has pioneered several endoscopic procedures in the state of Oklahoma.

Academic Section(s):

Digestive Diseases


Yale University, New Haven, MD
MD (1990)

Williams College, Williamstown, MA
B.A. (1986)

Board Certification(s):

American Board of Internal Medicine
Primary Speciality: Gastroenterology
Year of Certification: 1997- present


University of Pennsylvania, Philadelphia, PA
Internal Medicine (1993)


University of Michigan, Ann Arbor, MI
Gastroenterology (1997)



AGA Fellow (AGAF), 2008-Present
Arkansas-Oklahoma Endoscopy Society (AOES), 1997-Present
American Endosonography Club (ASGE Sprecial Interest Group), 1996-Present
American College of Gastroenterology (ACG), 1994-Present
American Gastroenterology Association (AGA), 1994-Present
American Society for Gastrointestinal Endoscopy (ASGE), 1994-Present
Alpha Omega Alpha, 1990-Present
Phi Beta Kappa, 1986-Present

Clinical/Research Interests:

  • Pancreatic cancer
  • Esophageal cancer
  • Colorectal cancer screening
  • Pancreatic cysts

Research Networking Profile


Tierney, W. (Site PI), Madhoun, M. F. (Co-Principal Investigator), "#577 Randomized Trial of Colonoscopy versus Fecal Immunochemical Testing for Colorectal Cancer Screening," Sponsored by VA Office of Research, Cooperative Studies Program, Federal
Additional Information: Total funding: $54,000,000.
March 2012 - March 2024

Select Honors & Accomplishments:

  • Castle Connolly Medical Ltd. "Top Doctors", 2008-2020
  • 2007-2020 "Best Doctors" by Best Doctors Ltd.
  • Fellow-American Society for Gastrointestinal Endoscopy
  • Fellow-American Gastroenterology Association
  • David Ross Boyd Professor of Medicine

Select Publications:

Aroniadis, O. C., DiMaio, C. J., Dixon, R. E., Elmunzer, B. J., Kolb, J. M., Mendelsohn, R., Ordiah, C. O., Rockey, D. C., Singal, A. G., Spitzer, R. L., Tierney, W., Wani, S., Yadav, D. (2020). Current Knowledge and Research Priorities in the Digestive Manifestations of COVID-19. Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association, 18(8), 1682-1684. PMID: 32334083. DOI: 10.1016/j.cgh.2020.04.039

Christman, E. M., Chandrakesan, P., Weygant, N., Maple, J. T., Tierney, W., Vega, K. J., Houchen, C. W. (2019). Elevated doublecortin-like kinase 1 serum levels revert to baseline after therapy in early stage esophageal adenocarcinoma. Biomarker Research, 7, 5. PMID: 30899515. DOI: 10.1186/s40364-019-0157-z

Smith, Z., Salem, G.*, Abegunde, A., Kaitha, S., Rubin, E., Tierney, W., Kastens, D. (2019). Hereditary diffuse gastric cancer: hard to see, hard to find. J OKLA State Med Assoc., 112(2), 42-46.

Ali, I. A., Mahmood, S., Tierney, W. (2019). Bouveret syndrome: a tough nut to crack. VideoGIE : an official video journal of the American Society for Gastrointestinal Endoscopy, 4(3), 126-127. PMID: 30899891. DOI: 10.1016/j.vgie.2018.11.007.

Hayat, M., Syed, T. A., Disbrow, M., Tran NTB, Asad ZUA, Tierney, W. (2018). Recurrent pancreatitis secondary to diffuse large B cell lymphoma. Journal of Gastrointestinal Cancer. PMID: 30393828. DOI: 10.1007/s12029-018-0175-3

Madhoun, M. F., Chaudrey, K. K., Chisholm, S. S., Ahmed, A., Frost, B., Tierney, W. (2018). Efficacy and tolerability of various bowel preparations in diabetic patients: a randomized controlled trial. Endoscopy international open, 6(10), E1157-E1163. PMID: 30302371. DOI: 10.1055/a-0650-3908.

Nusrat, S., Madhoun, M. F., Tierney, W. (2018). Use of diphenhydramine as an adjunctive sedative for colonoscopy in patients on chronic opioid therapy: a randomized controlled trial. Gastrointest Endosc, 88(4), 695-702. PMID: 29689257. DOI: 10.1016/j.gie.2018.04.2342.

Bitar, H., Zia, H., Bashir, M., Parava, P., Hanafi, M., Tierney, W., Madhoun, M. F. (2018). Impact of fellowship training level on colonoscopy quality and efficiency metrics. Gastrointest Endosc, 88(2), 378-387. PMID: 29679692. DOI: 10.1016/j.gie.2018.04.2338.

Kaitha, S. R.*, Salem, G., Zhao, Y. D., Madhoun, M. F., Chen, A. J., Tierney, W. (2016). The impact on endoscopic resource utilization after a targeted intervention for cost-minimization of EGD and colonoscopy. Am J Gastro, 111(11), 1559-1563. PMID: 27575709. DOI: 10.1038/ajg.2016.340.

Chisholm, S., Patel, A. M., Tierney, W., Madhoun, M. F. (2015). Adult bowel preparations for colonoscopy. J OKLA State Med Assoc., 108(7), 311-7. PMID: 26390770.