Our Providers

The physicians at Amarillo Diagnostic Clinic practice adult general and sub-specialty care and are committed to delivering the highest quality health care to you and your family. Our distinguished group of highly qualified, highly trained physicians can meet the challenge of today’s complex healthcare needs. All of the physicians at Amarillo Diagnostic Clinic are board certified or board eligible in their specialty. You can trust the quality of your physician at Amarillo Diagnostic Clinic.


Daniel A. Beggs, M.D.Daniel A. Beggs, M.D.

Amarillo Diagnostic Clinic staff since 1998

Expertise: Gastroenterology
Education: University of Kansas School of Medicine, Kansas City, Ks. 1988- 1992.
Internship/Residency: University of Kansas Medical Center, Department of Internal Medicine Kansas City, KS. 1992-1995.
Gastroenterology Fellowship: University of Kansas Medical Center, Division of Gastroenterology, Kansas City, Ks. 1995 - 1998.
Board Certifications: American Board of Internal Medicine, Gastroenterology
Publications: "Pelvic Exenteration in Failed Rectal Cancer Surgery" American Surgeon, July 1993. "Massive Esophogeal Hematoma: Incidence of a Rare Complications of Sclerotherapy" (Abstract) Gastrointestinal Endoscopy, April 1996.
Memberships: Potter-Randall Medical Society, Texas Medical Association.

 


R. Todd Ellington, Jr., M.D. R. Todd Ellington, Jr., M.D.

Amarillo Diagnostic Clinic staff since 1999
President 2007-2008

Expertise: Gastroenterology
Education: Southern Methodist University, BA, Chemistry; University of Texas Health Science Center, San Antonio, Texas
Internship/Residency: University of Texas Southwestern Medical School, Dallas, Texas.
Gastroenterology Fellowship: University of Texas Southwestern Medical School, Dallas, Texas
Expertise: Hepatology, Colorectal Diseases, Esophageal-Stomach and Intestinal Disorders, Endoscopy, Gastroesophoreal Reflux, Peptic Ulcer Disease, ERCP, Endoscopic US
Board Certification: American Board of Internal Medicine; Gastroenterology
Memberships: American College of Physicians, American Medical Association, American College of Gastroenterology, American Gastroenterology Association, Texas Medical Association,
Potter-Randall Medical Society.

 


Thomas Johnson, M.D. Thomas Johnson, M.D.

Amarillo Diagnostic Clinic staff since 1983

Expertise: Gastroenterology
Education: University of Texas Medical Branch, Galveston, Texas - 1977.
Internship/Residency: Internal Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK., 1977 - 1981.
Chief Residency: University of Oklahoma Health Sciences Center, Oklahoma City, OK, 1980 - 1981.
Gastroenterology Fellowship: Duke University, Durham, North Carolina, 1981 -1983.
Board Certifications: American Board of Internal Medicine, Gastroenterology
Memberships: Potter-Randall Medical Society, Texas Medical Association.

 


James E. Lusby, M.D. James Lusby

Amarillo Diagnostic Clinic staff since 2006

Expertise: Gastroenterology
Education: Texas Tech University Health Sciences Center School of Medicine, Lubbock, TX - 2000
Internship/Residency: Scott & White Hospital & Clinics, Temple, TX - 2000-2003
Gastroenterology Fellowship: Scott & White Hospital & Clinics, Temple, TX - 2003-2006
Board Certification: American Board of Internal Medicine, Gastroenterology
Memberships: Member AGA, ASGE, ACG, Member American College of Physicians, Texas Medical Association Local Society.

 


Dr. Hagos TekesteWilliam Shear, M.D.

BSA Amarillo Diagnostic Clinic is pleased to welcome Dr. William Shear to Amarillo.  Dr. Shear specializes in Gastroenterology. He will begin seeing patients starting May 1, 2016.

Expertise: Gastroenterology
Education: Johns Hopkins University, Baltimore, MD - Bachelors degree in Biology from Johns Hopkins University, Baltimore, MD - Doctorate of Medicine from the University of Arizona College of Medicine, Tucson, AZ
Internship/Residency: Internal Medicine. University of Virginia Health System, Charlottesville, VA
Gastroenterology Fellowship: Gastroenterology and Hepatology, University of Virginia Health System, Charlottesville, VA
Board Certification: Internal Medicine, American Board of Internal Medicine; Gastroenterology and Hepatology

 


Hagos Tekeste, M.D. Dr. Hagos Tekeste

Medical Staff Member of ADC Endoscopy

Expertise: Gastroenterology
Education: Yale University, (B.A. 1974), NH, Conn, University of Pennsylvania (M.D. 1978)
Internship/Residency: Presbyterian University of Pennsylvania Medical Center (1978-1981)
Gastroenterology Fellowship: Presbyterian University of Pennsylvania (1981-1983)
Board Certification: American Board of Internal Medicine, Gastroenterology
Memberships: Clinic Associate Professor of Medicine, Texas Tech University of Health Science Center (1983-Present), Texas Medical Association, PRCMS, AGA, ASGE, ACG, TSGE

 


Abdul Thannoun, M.D. Dr. Hagos Tekeste

Medical Staff Member of ADC Endoscopy
Amarillo Diagnostic Clinic staff since 2006

Memberships: Texas Medical Association, American College of Physicians, American Gastroenterology Association, American College of Gastroenterology, National Arab American Medical Association, Texas Society of Gastrointestinal Endoscopy.