Dr. Tielleman is originally from San Antonio, TX but moved to Dallas to study at UT Southwestern for medical school. He has remained engrained within DFW and the UT Southwestern system ever since, having completed his Internal Medicine residency, Gastroenterology fellowship (Chief Fellow), and his Advanced Endoscopy training at UT Southwestern Medical Center. Dr. Tielleman specializes in General and Advanced Endoscopy. He has interests in biliary disorders, pancreatic cancer prevention, and therapeutic endoscopy. Dr. Tielleman’s interests outside of medicine include his family, cooking, and travel.


Medical School
UT Southwestern Medical School (2014)
UT Southwestern Medical Center (2017), Internal Medicine
UT Southwestern Medical Center (2020), Gastroenterology

Research Interest

  • Hepatobiliary Disorders
  • Therapeutic Endoscopy


Featured Publications LegendFeatured Publications

Prognostic Value of Hypochloremia in Critically Ill Patients With Decompensated Cirrhosis.
Sumarsono A, Wang J, Xie L, Cerro Chiang G, Tielleman T, Messiah SE, Singal AG, Mufti A, Chen C, Leveno M, Crit. Care Med. 2020 Sep
Epidemiology and Risk Factors for Upper Gastrointestinal Bleeding.
Tielleman T, Bujanda D, Cryer B, Gastrointest Endosc Clin N Am 2015 Jul 25 3 415-28


Featured Books Legend Featured Books

Honors & Awards

  • Alpha Omega Alpha (Medical Honor Society)
    Member (2017)
  • UT Southwestern Internal Medicine Teaching Award
    UT Southwestern (2017)

Professional Associations/Affiliations

  • American College of Gastroenterology (2017)
  • American Gastroenterological Association (2017)
  • American Society of Gastrointestinal Endoscopy (2017)