Mark L. Ryan, M.D., M.S.P.H., FACS, is an Assistant Professor in the Department of Surgery and the Assistant Director of Pediatric Trauma at UT Southwestern Medical Center. He specializes in pediatric trauma and surgical critical care. 

Dr. Ryan earned his medical degree at Yeshiva University’s Albert Einstein College of Medicine. He completed a residency in general surgery at the University of Miami Miller School of Medicine, where he also earned a Master of Science in Public Health. He then received advanced training in pediatric surgical critical care and pediatric surgery through separate fellowships at Le Bonheur Children’s Hospital/The University of Tennessee Health Science Center and Arkansas Children’s Hospital/University of Arkansas for Medical Science, respectively.

Board certified in surgery, pediatric surgery, and surgical critical care, he joined the UT Southwestern faculty in 2018. He is the Associate Medical Director of Trauma Services and the Surgical Medical Director for ECMO and Trauma Critical Care.

Dr. Ryan is a member of multiple medical societies relating to trauma and pediatric surgery. He serves on local and national committees on surgical critical care, trauma, and disaster management. He has contributed to two books and written dozens of articles.

Education & Training
  • Graduate School - University of Miami Miller School of Medicine (2010-2014), Public Health
  • Residency - University of Miami School of Medicine (2007-2014), General Surgery
  • Medical School - Albert Einstein College of Medicine (2002-2007)
  • Fellowship - Lebonheur Children's Medical Center (2014-2015), Pediatric Critical Care Medicine
  • Fellowship - Arkansas Children's Hospital (2016-2018), Pediatric Surgery
  • Other Post Graduate Training - University of Miami Miller School of Medicine (2010-2014)
Professional Associations & Affiliations
  • American College of Surgeons
  • American Pediatric Surgical Association
  • American Academy of Pediatrics
  • Pediatric Trauma Society
  • International Pediatric Endosurgery Group
  • The American Association for the Surgery of Trauma
Honors & Awards
  • Fellow of the American College of Surgeons 2021
  • University of Miami/Jackson Memorial Hospital 2012, Robert Zeppa Resident Research Award
  • Society of American Gastrointestinal and Endoscopic Surgeons Annual Meeting 2012, 2nd Place: Top Gun Laparoscopic Skills Competition
  • The American Association for the Surgery of Trauma 2011, Medical Student/Resident Scholarship
Books & Publications
  • Books
    • Rectal Injuries in Current Surgical Therapy, 12th Edition
      Ryan ML, Croce MA (2015), Philadelphia, Elsevie
    • Deep Venous Thrombosis in Surgery: Evidence Based Practice
      Ryan ML, Thorson CM, Vu T, Otero CA, Ginzburg E (2012), Beijing, China, PMPH USA
  • Gillory L, Cairo S, Megison S, Vinson L, Chung D, Ryan ML. Effect of Quarantine and Reopening Measures on Pediatric Trauma Admissions During the COVID-19 Pandemic. JACS. 2022 Apr; 234(4); 685-90
  • Sanford EL, Zagory J, Blackwell J, Szmuk P, Ryan ML, Ambardekar A. Changes in pediatric trauma during COVID-19 stay-at-home epoch at a tertiary pediatric hospital. J Pediatr Surg. 2021 May; 56(5): 918-22
  • Mokdad AA, Wolf LW, Pandya S, Ryan ML, Qureshi, FG. Road traffic accidents and disparities in child mortality. Pediatrics. 2020 Oct; 146(5): e20193009
  • Bonasso PC, Dassinger MS, Ryan ML, Gowen MS, Burford JM, Smith SD. 24-hour and 30-day perioperative mortality in pediatric surgery. J Pediatr Surg. 2019 Apr; 54(4): 628-630.
  • Ryan ML, Maxwell AC, Manning L, Jacobs JD, Bachier-Rodriguez M, Feliz A, Williams RF. Noninvasive hemoglobin measurement in pediatric trauma patients. J Trauma Acute Care Surg. 2016 Dec; 81(6): 1162-6.
  • Ryan ML, Zhuge Y, Smothers CD, Zhang J, Huang EY: Intraluminal Esophageal Teratoma in a Neonate. J Pediatr Surg Case Rep. 2015 Oct; 3(10): 451-4
  • Ryan ML, Van Haren RM, Thorson CM, Andrews DM, Perez EA, Neville HL, Sola JE, Proctor KG: Trauma induced hypercoagulability in pediatric patients. J Pediatr Surg. 2014 Aug; 49(8): 1295-9
  • Thorson CM, Van Haren RM, Ryan ML, Curia E, Sleeman D, Levi Ju, Livingstone AS, Proctor KG: Pre-existing hypercoagulability in patients undergoing potentially curative cancer resection. Surgery. 2014 Jan; 155(1): 134-44
  • Van Haren RM, Ryan ML, Thorson CM, Namias N, Livingstone AS, Proctor KG: Bilateral near infrared spectroscopy for detecting traumatic vascular injury. J Surg Res 2013 Apr; 184(1), 526-527.
  • Thorson CM, Ryan ML, Pereira R, Olloqui J, Otero CA, Schulman CI, Livingstone AS, Proctor KG. Change in hematocrit during trauma assessment predicts bleeding even with ongoing fluid resuscitation. Am Surg 2013 Apr;79(4):398-406
  • Thorson CM, Van Haren RM, Ryan ML, Curia E, Sleeman D, Levi JU, Livingstone AS, Proctor KG: Persistence of hypercoagulable state after resection of intraabdominal malignancies. J Am Coll Surg 2013 Apr;216(4):580-9
  • Davis JS, Ryan ML, Fields JM, Neville HL, Perez EA, Sola JE. Use of CT enterography for the diagnosis of lower gastrointestinal bleeding. J Pediatr Surg. 2013 Mar; 48(3):681-4
  • Thorson CM, Van Haren RM, Ryan ML, Pereira R, Olloqui J, Guarch GA, Curia E, Barrera JM, Buska AM, Livingstone AS, Proctor KG. Admission hematocrit and transfusion requirements after trauma. J Am Coll Surg 2013 Jan;216(1):65-73
  • Davis JS, Ryan ML, Perez EA, Neville HL, Bronson SN, Sola, JE: ECMO hospital volume and survival in congenital diaphragmatic hernia repair. J Surg Res 2012 Dec; 178(2):791-6
  • Thorson CM, Ryan ML, Van Haren RM, Curia E, Barrera J, Guarch GA, Busko AM, Namias N, Livingstone AS, Proctor KG: Venous thromboembolism after trauma: a never event? Crit Care Med 2012 Nov; 40(11):2967-73
  • Thorson CM, Van Haren RM, Ryan ML, Curia E, Sleeman D, Levi Ju, Livingstone AS, Proctor KG: Preoperative hypercoagulability is associated with advanced disease in cancer. J Am Coll Surg 2012 Sept; 215 (3S); S128-9
  • Ryan ML, Ogilvie MP, Pereira BMT, Gomez-Rodriguez JC, Livingstone AS, Proctor KG: Effect of hetastarch bolus in trauma patients requiring emergency surgery. J Spec Oper Med 2012 Fall; 12(3):57-67.
  • Thorson CM, Dubose JJ, Rhee PM, Knuth TE, Garcia GD, Ryan ML, Van Haren RM, Proctor KG: Military trauma training at civilian centers: a decade of advancement. J Trauma Acute Care Surg. 2012 Aug;73(2):385-390
  • Davis JS, Ryan ML, Shields JS, Neville HL, Perez EA, Sola JE, Rodriguez MM. Segmental absence of intestinal musculature: an increasingly reported pathology. J Pediatr Surg 2012 Aug; 47(8): 1566-71
  • Ryan ML, Thorson CM, King DR, Van Haren RM, Manning RJ, Andrews DM, Livingstone AS, Proctor KG: Insertion of central venous catheters induces a hypercoagulable state. J Trauma 2012 Aug; 73(2):385-90
  • Thorson CM, Ryan ML, Otero CA, Vu T, Schulman CI, Livingstone AS, Proctor KG: Operating room or angiography suite for hemodynamically unstable pelvic fractures? J Trauma 2012 Feb 72(2):364-372
  • Ryan ML, Thorson CM, Otero CA, Vu T, Schulman CI, McKenney MG, Livingstone AS, Proctor KG. Initial hematocrit in trauma: a paradigm shift? J Trauma. 2012 Jan 72(1):54-60
  • Ogilvie MP, Pereira BMT, Ryan ML, Gomez-Rodriguez JC, Pierre EJ, Livingstone AS, McKenney MG, Proctor KG: Bispectral index (BIS) to monitor propofol sedation in trauma patients. J Trauma.2011 Nov; 71(5):1415-21
  • Ryan ML, Thorson CM, Otero CA, Ogilvie MP, Cheung MC, Saigal GM, Thaller SR: Pediatric facial trauma: a review of guidelines for assessment, evaluation, and management in the emergency department. J Craniofacial Surg. 2011 Jul; 22(4): 1183-9
  • Ryan ML, Ogilvie MP, Pereira BMT, Gomez-Rodriguez JC, Manning RJ, Vargas P, Duncan RC, Proctor KG: Heart rate variability is an independent predictor of morbidity and mortality in hemodynamically stable trauma patients. J Trauma. 2011 June; 70(6); 1371-1380
  • Ogilvie MP, Ryan ML, Proctor KG. Hetastarch during Initial resuscitation from trauma. J Trauma. 2011 May; 70(5 Suppl): S19-21
  • Ryan ML, Fields JM, Sola JE, Neville HL: Portal venous gas and cardiopulmonary arrest during pneumatic reduction of an ileocolic intussusception. J Pediatr Surg. 2011 Apr; 46(4); e5-8
  • Seifarth FG, Ryan ML, Triana J, Knight CG. Diagnosis and laparoscopic treatment of ilioileal intussusception secondary to heterotopic pancreas in an infant: case report and review of the literature. J Pediatr Surg. 2011 Feb; 46(2) e33-6.
  • Ryan ML, Thorson CM, Otero CA, Vu T, Proctor KG: Clinical applications of heart rate variability in the triage and assessment of traumatically injured patients. Anesthesiol Res Pract. 2011 Feb 10: 416590
  • Pereira BMT, Ryan ML, Garcia GD. Treinamento em trauma para o time avançado de cirurgia do Exército Americano. Arq Bras Med Naval. 2010;71(1):14-20.
  • Pereira BMT, Ryan ML, Ogilvie MP, Gomez-Rodriguez JC, McAndrew P, Garcia GD, Proctor KG: Pre-deployment mass casualty and clinical trauma training for U.S. Army forward surgical teams. J Craniofac Surg. 2010 Jul; 21 (4):982-6
  • Oglivie MP, Pereira BMT, Ryan ML, Panthaki ZJ: Emergency department assessment and management of facial trauma from war-related injuries. J Craniofac Surg. 2010 Jul; 21(4): 1002-8
  • Pereira BM, Ogilvie MP, Gomez-Rodriguez JC, Ryan ML, Pena D, Marttos AC, Pizano LR, McKenney MG: A review of ureteral injuries after external trauma. Scand J Trauma Resusc Emerg Med. 2010 Feb 3; 18 (1):6
  • Ryan ML, Velasquez, O, Patel S, Martinez, E, Parodi, J, Karmacharya, J. Thoracic aortic transection treated by thoracic endovascular aortic repair: predictors of survival. Vasc Endovascular Surg. 2010 Feb; 44(2) 95-100

Clinical Focus

  • Extracorporeal Membrane Oxygenation (ECMO)
  • Surgical Critical Care
  • Pediatric Trauma
  • Chest Wall Deformity
  • Minimally Invasive Gastrointestinal and Thoracic Surgery
  • Neonatal Surgery

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Mark Ryan, M.D.

Dr. Ryan talks about his approach to patient care.