Digestive Diseases and Nutrition

MEET THE OU PHYSICIAN'S GASTROENTEROLOGY TEAM

CLINICAL FACULTY

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Courtney W. Houchen, M.D.

Regents' Professor
Eason Chair of Oncology
Chief, Digestive Diseases and Nutrition 
Professor of Medicine

405-271-5428 (Office)
405-271-5803 (Fax)
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Dr. Houchen is section chief of Digestive Diseases and Nutrition, Department of Medicine, at the University of Oklahoma, College of Medicine. He also holds the Frances & Malcolm Robinson Chair and is a professor of medicine. He has a specific interest in preventing, diagnosing and treating gastrointestinal cancers, colorectal cancer screening, prostaglandin receptor and gastrointestinal injury. He comes to OU Physicians from Washington University School of Medicine, St. Louis, where he completed a gastroenterology fellowship. He completed his residency at the University of Maryland Medical Center, College Park, and earned his medical degree at Temple University School of Medicine, Philadelphia.

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William M. Tierney, MD, FASGE, AGAF

Frances K. and 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, Digestive Diseases

405-271-5428 (Office)
405-271-5803 (Fax)
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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 Professor of Medicine at the University of Oklahoma and serves as Director of Endoscopic Ultrasound, 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 list of Best Doctors in Oklahoma every year from 2008-2018, the Best Gastroenterologist List in Oklahoma Magazine 2007-2018.  He was named to America's Top Gastroenterologist 2008-2011 through the Consumer's Research Council of America.  He is committed to service and has served on several national committees and is currently on 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.

Practices at:  OU Medical Center Endoscopy Lab and Med-specialty Clinic, OU Physicians Clinic and Endoscopy Lab, and the VA Hospital Endoscopy Lab and Med-specialty Clinic

Clinical Interests: Pancreatic Disease, Gastrointestinal Cancer, Colon Cancer Screening

Procedures: Upper Endoscopy, Colonoscopy, Endoscopic Mucosal Resection, Endoscopic Ultrasound, and ERCP

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Hussein Bitar, MD

Assistant Professor of Medicine
 
405-271-5428 (Office)
405-271-5803 (Fax)
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Dr. Bitar graduated from the Lebanese University-Faculty of Sciences and received his medical degree from the Lebanese University-Faculty of Medical Sciences in 2011.  He subsequently completed a residency in Internal Medicine and fellowship in Gastroenterology at the University of Oklahoma.  During part of his fellowship, he completed an away rotation in Inflammatory Bowel Diseases at Northwestern University in Chicago.  He is currently an Assistant Professor of medicine at the University of Oklahoma.  Dr. Bitar is board certified in internal medicine and gastroenterology.  He has received the University of Oklahoma, College of Medicine Gold Humanism Award in Medicine in 2017.  He is a member of the American College of Gastroenterology, the American Gastroenterological Association, the American Society of Gastrointestinal Endoscopy and the Crohn's and Colitis Foundation.

Practices at:  OU Medical Center Endoscopy Lab and Med-specialty Clinic, OU Physicians Clinic and Endoscopy Lab

Clinical Interests: Inflammatory Bowel ​Diseases (i.e., Crohn's Disease and Ulcerative Colitis), ​Small ​Bowel ​Disorders, ​Colon ​Cancer Screening

Procedures: Upper Endoscopy, Colonoscopy, Endoscopic Mucosal Resection, Video Capsule Endoscopy, and Single Balloon Small Bowel Enteroscopy

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Javid Fazili, M.D.

Associate Professor of Medicine

405-271-5428 (Office)
405-271-5803 (Fax)
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Dr. Fazili is a board-certified gastroenterologist and associate professor at the OU College of Medicine. He has a special interest in hepatology and liver transplantation. Fazili completed a fellowship at Albert Einstein Medical Center, Thomas Jefferson University Hospital. He completed a residency at the University Institute of Medical Sciences, Nassau County Medical Center and earned his medical degree from the University of Kashmir.

Practices at: OU Medical Center Endoscopy Lab and Med-specialty Clinic, OU Physicians Clinic and Endoscopy Lab, and the VA Hospital Endoscopy Lab and VA Liver Clinic
 
Clinical Interests: Hepatology, Liver Transplant

Procedures: Upper Endoscopy, Colonoscopy, Sigmoidoscopy, Enteroscopy, Liver Biopsy and ERCP

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Ralph T. Guild III, M.D.

Professor of Medicine
Chief, Section of Gastroenterology and Nutrition, Medicine Service, Oklahoma City Veterans Affairs Medical Center

405-270-0501 x5313 (VA Office)
405-270-1529 (Fax)
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Dr. Guild is a board-certified gastroenterologist and a professor at the OU College of Medicine. Dr. Guild sees patients at the Oklahoma City Veterans Affairs Medical Center and at OU Physicians. He has a special interest in diagnosing and treating patients with Gastroesophageal Reflux Disease and Peptic Ulcer Disease. Guild completed a fellowship and residency at the University of Florida after earning his medical degree at the OU College of Medicine.​

Practices at: OU Medical Center Endoscopy Lab, OU Physicians Clinic and Endoscopy Lab, and the VA Hospital Endoscopy Lab and Med-Specialty Clinic

Clinical Interests: 
General Gastroenterology, Nutrition

Procedures: Upper Endoscopy, Colonoscopy, Enteroscopy, Liver Biopsy, Capsule Endoscopy and ERCP

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Kanagala
Rajesh Kanagala, MD

Assistant Professor of Medicine

405-271-5428 (Office)
405-27​1-​5803 (Fax)
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Dr. Kanagala  completed his medical education at Osmania Medical College in India obtaining his M.B.B.S in March of 1999.  He then did his internship in ​internal medicine in New York and moved to Milwaukee, Wisconsin where he completed ​​residency at the Medical College of Wisconsin in April of 2006.  After completing his residency, he worked as an ​assistant professor and hospitalist at the Medical College of Wisconsin through November of 2007. It was at that time that he moved to Oklahoma City to work as a hospitalist in hepatology for the Nazih Zudi Transplant Institute at Integris Baptist Medical Center.  He moved to the Oklahoma Transplant Center at OU Medical Center in April of 2010 where he was the Assistant Director.  He was part of a liver transplant team that started the Liver Transplant Program at OU Medical Center.  In July of 2013, he started his fellowship in gastroenterology at the University of Oklahoma feeling the experience would be beneficial for him to provide care for his patients.  Upon completion of his fellowship, he became an Assistant Professor of Medicine at the University of Oklahoma as well as maintaining his position at the Oklahoma Liver Transplant Center.  Dr. Kanagala is a member of 4 national societies: American Association for ​the ​Study of Liver Diseases (AASLD), American Society ​for Gastrointestinal Endoscopy (ASGE), American Gastroenterological Association (AGA), and the American College of Gastroenterology (ACG).

Dr. Kanagala has further serve​d ​our community, since 2013, by volunteering as a physician at the Good Shepherd Ministries Free Clinic.  He has a special interest in chronic HBV and HCV infections, autoimmune liver diseases and hepatocellular carcinoma (HCC).


Practices at: 
OU Medical Center Endoscopy Lab and Fellows Continuity Clinic, OU Physicians Clinic and Endoscopy Lab, the VA Endoscopy Lab and VA Liver Clinic, and the Oklahoma ​Liver Transplant Center
  
Clinical Interests: Chronic Hepatitis B and C, Autoimmune Liver Diseases, Hepatocellular Carcinoma and Complications of Cirrhosis

Procedures: Upper Endoscopy, Colonoscopy, Enteroscopy, and Liver Biopsy

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Donald J. Kastens, M.D.

Associate Professor of Medicine

405-271-5428 (Office)
405-271-5803 (Fax)
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Dr. Kastens is a board certified gastroenterologist and an Associate Professor at the OU College of Medicine. He has a special interest in diagnosing and treating patients with esophageal motility disorders and Gastroesophageal Reflux Disease. Kastens completed a fellowship, residency and earned his medical degree at the OU College of Medicine.

Practices at: OU Medical Center Endoscopy Lab and OU Med-specialty Clinic, OU Physicians Clinic and Endoscopy Lab, OU Fellows Med-Specialty Clinic, and the VA Hospital Endoscopy Lab

Clinical Interests: Gastro-esophageal Reflux Disease, Motility Disorders

Procedures: Upper Endoscopy, Colonoscopy, Enteroscopy, Liver Biopsy, Esophageal Motility and ERCP

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Mohammad Madhoun, M.D., MS, FACP

Associate Professor of Medicine
Director of Endoscopy, Veterans Affairs Medical Center

405-271-5428 (Office)
405-271-5803 (Fax)
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Dr. Mohammad Madhoun completed his medical degree at the Jordan University of Sciences and Technology in 2003, followed by the completion of an internship at the Princess Basma Hospital in Irbid, Jordan and a transitional residency year at the King Hussein Cancer Center in Amman, Jordan.   In 2005, he came to the University of Oklahoma Health Sciences Center to complete a residency program in Internal Medicine before applying for a fellowship position in the Digestive Diseases and Nutrition Section of Internal Medicine on the University of Oklahoma Health Sciences Center campus.

In July 2011, Dr. Mohammad Madhoun was presented the Richard F. Harty, M.D. Gastroenterology Fellow Award for Oustanding Fellow in Gastroenterology upon his completion of the GI Fellowship program in Digestive Diseases and Nutrition here at the University of Oklahoma Health Sciences Center.  Dr. Madhoun added to his training by earning a Master of Science in Clinical Translational Sciences during his fellowship.

Dr. Madhoun is the local Site Director for the Gastroenterology Fellowship Program while also serving as the Director of Endoscopy at the Veterans Affairs Medical Center.  Dr. Madhoun has a passion for teaching and has served as the Associate Director of the Gastroenterology / Hepatology Course for 1st year medical students at the University of Oklahoma Health Sciences Center since 2014.  He has been rewarded for his teaching efforts by being inducted into the Academy of Teaching Scholars in 2016 and in 2017 he was selected by his students to be presented with the prestigious Aesculapian Award for excellence in teaching.

Dr. Madhoun served as a Member of the Institutional Review Board for the College of Medicine, University of Oklahoma from 2012-2016, Vice Chair from 2016-2018, and in 2018 he took over as Chair.  Further for the Gastroenterology Fellowship Program, he serves as a highly valued member of the Program Evaluation and the Clinical Competency Committees as well as an active member of four committees at the Veterans Affairs Medical Center; the Operative and Invasive Committee, the Research and Development Committee, the Cancer Committee, and the Medical Record Committee. On the national level he has served as an active member of the ASGE Research Committee for two periods, 2012-2015, and 2017 to present.  He is an editorial board member for The World Journal of Gastroenterology and Pancreatic Disorders & Therapy.  He has three active grants and one clinical trial that he services as PI or CO-PI or Site Director.   

Practices at: OU Medical Center Endoscopy Lab and OU Med-specialty Clinic, the VA Hospital Clinic, VA Endoscopy Lab, and VA Med-specialty Clinic

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Maple
John T. Maple, DO

Associate Professor of Medicine
Director of Interventional Endoscopy

405-271-5428 (Office)
405-271-5803 (Fax)
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Dr. Maple was recruited to OU Medical Center in 2007 as an Assistant Professor of Medicine, and was named Director of Interventional Endoscopy in 2008. A native Oklahoman, he attended Oklahoma Christian University and graduated from Oklahoma State University - College of Osteopathic Medicine in 2000. Subsequently, he completed an Internal Medicine residency and Gastroenterology fellowship at Mayo Clinic College of Medicine in Rochester, Minnesota. Dr. Maple then completed an Advanced Endoscopy fellowship at Washington University in St. Louis, focusing on training and clinical research in ERCP and EUS. He is board certified in Internal Medicine and Gastroenterology and has pioneered several endoscopic procedures in the state of Oklahoma.

Practices at: OU Medical Center Endoscopy Lab and OU Med-specialty Clinic, OU Physicians Clinic and Endoscopy Lab, and the VA Hospital Endoscopy Lab

Clinical Interests: Pancreatic Disease, Gastrointestinal Cancer

Procedures: Upper Endoscopy, Colonoscopy, Enteroscopy, Liver Biopsy, Endoscopic Ultrasound, and ERCP

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All​an Weston, M.D.

Professor of Medicine
Veterans Affairs Medical Center
 
405-271-5428 (Office)
405-271-5803 (Fax)

Dr. Weston received at BS in Chemistry with Honors and Distinction from Indiana University, Bloomington IN in 1982.  He then attended the Indiana University School of Medicine, Indianapolis, IN graduating followed by  a three year Internal Medicine Residency at University of Iowa Hospital and Clinics in Iowa City, IA.  A Gastroenterology-Hepatology Fellowship was completed in 1992 at University of Kansas Medical Center, Kansas City Kansas, where he remained for the next 12 years a faculty member, promoted to Associate Professor of Medicine and became the GI-Hepatology Section Chief at the Kansas City, VAMC.  During his tenure in Kansas CIty, Dr. Weston co-authored over 50 original manuscripts, presented over 100 abstracts and wrote 2 book chapters and undertook research. Clinical and translational research was undertaken in Helicobacter pylori infection and Gastric Lymphoma as well as the risk stratification of Barrett’s Esophagus into cancer. Clinical research also focused on conducting phase 2 and 3 clinical trials on chronic hepatitis C and B treatment.  The academic environment also created an opportunity to master many diagnostic and therapeutic skills including endoscopic ultrasonography, photodynamic therapy, Nd:YAG laser ablation, chromoendoscopy and magnification endoscopy. Although he has a wide number of clinical interests involving the pancreas, colon, liver and esophagus,  major clinical research interests currently involve non-invasive imaging of the liver for assessment of severity of steatosis and fibrosis, the molecular stratification of cystic neoplasms of the pancreas, and breath testing for gastric emptying and bacterial overgrowth. Dr. Weston also has served as Governor for the American College of Gastroenterology for both Missouri and Kansas and is a reviewer for several gastroenterology journals. Dr. Weston is excited to a member of the OU Medical Staff and is dedicated at giving his patients state of the art, compassionate care.

Practices at: VA Hospital Endoscopy Lab
 
Clinical Interests: Pancreas, Colon, ​Liver and ​Esophagus,  
 
Procedures: 

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NURSE PRACTITIONER

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Bansi Daniel, APRN-CNP, AGNP, MSN

Nurse Practitioner

405-271-8001 Ext. 53424 (Office)
405-271-5803 (Fax)
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In 2009, Bansi received her Bachelor of Science in Nursing from Southern Nazarene University in Bethany, Oklahoma.  Later in 2013, she received her MSN in Adult & Gerontological , Primary Care Nurse Practitioner from Saint Louis University. She maintains memberships with the American Academy of Nurse Practitioners (AANP), the Association of Oklahoma Nurse Practitioners (AONP), the American Academy of Professional Coders (AAPC) and the North American Transplant Coordinators Association (NATCO).

Bansi Daniel APRN-CNP is Board Certified  by the American Academy Nurse Credentialing Center, and licensed by the state of Oklahoma  to provide healthcare to patients  ages 13 and above. Her clinical interests are in hepatology and Hepatitis C.


Practices at: OU Physicians Building, Adult Gastroenterology Clinic

Clinical Interests: Hepatology and Hepatitis C

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