Current Fellows
Third-Year Fellows (2022-2025)
![Geoffrey Daves, M.D.](/departments/pediatrics/divisions/gastroenterology/assets/daves-geoffrey-photo.jpg)
Geoffrey Daves, M.D.
Education
B.S., Texas A&M International University, Laredo, TX, 2009
M.S., University of Texas HSC at San Antonio, San Antonio, TX, 2013
M.D., Ross University SOM, Plantation, FL, 2018
Postdoctoral Training
Nassau University Medical Center, East Meadow, NY, General Surgery Residency, 2018–2019
Tufts Children’s Hospital, Boston, MA, Pediatric Residency, 2019–2022
![Ashley Fonseca, M.D.](/departments/pediatrics/divisions/gastroenterology/assets/fonseca-ashley-photo.jpg)
Ashley Fonseca, M.D.
Education
B.S. (Magna Cum Laude), University of Puerto Rico, Rio Piedras Campus, San Juan, PR, 2015
M.D., Universidad Central del Caribe, Bayamón, PR, 2019
Postdoctoral Training
Nicklaus Children’s Hospital, Miami, FL, 2019–2022
![Claudia Moreda Rivero, M.D.](/departments/pediatrics/divisions/gastroenterology/assets/moreda-rivero-claudia-photo.jpg)
Claudia Moreda Rivero, M.D.
Education
B.S., University of Puerto Rico, Río Piedras, PR, 2014
M.D., Universidad Central del Caribe (UCC) School of Medicine, Bayamon, PR, 2019
Postdoctoral Training
University of Puerto Rico School of Med Children’s Hospital Dr. Antonio Ortiz, San Juan, PR, Pediatric Residency, 2019–2022
- Testimonial
“My experience as a first-year pediatric gastroenterology fellow has been one of immense learning. Being able to train at a major pediatric referral center in the area gives me the opportunity to learn from a great variety of pathologies and allows me to be exposed to multiple different procedures. I will be forever grateful to my past mentors that have helped me become the person I am today, and to my current ones that in this short time have taught me so much about the GI world. You would never regret becoming part of the UTSW family!”
Second-Year Fellows (2023-2026)
![Ashley Polachek, M.D.](/departments/pediatrics/divisions/gastroenterology/assets/polachek-ashley-photo.jpg)
Ashley Polachek, M.D.
Education
B.S. (Summa Cum Laude), Roberts Wesleyan College , Rochester, NY, 2015
M.D. (Cum Laude), State University of New York at Buffalo, Jacob's School of Medicine and Biomedical Sciences, Buffalo, NY, 2019
Postdoctoral Training
Rush University Medical Center, Chicago, IL, Pediatric Residency, 2019–2022
![Alexandra Pottorff, M.D.](/departments/pediatrics/divisions/gastroenterology/assets/pottorff-alexandra-photo.jpg)
Alexandra Pottorff, M.D.
Education
B.A., Austin College, Sherman, TX, 2016
M.P.H., UT Health School of Public Health, Dallas, TX, 2020
M.D., UT Southwestern, 2020
Postdoctoral Training
Boston Children’s Hospital/Boston Medical Center, Boston, MA, Pediatric Residency, 2020–2023
![Justin Williams, M.D.](/departments/pediatrics/divisions/gastroenterology/assets/williams-justin-photo.jpg)
Justin Williams, M.D.
Education
B.S., University of Texas at Austin, Austin, TX, 2014
M.D., Texas Tech University Health Sciences Center School of Medicine, Lubbock, TX, 2019
Postdoctoral Training
UT Southwestern, Dallas, TX, Pediatric Residency, 2019–2022, Chief Resident, 2022–2023
First-Year Fellows (2024-2027)
![Default Photo](/departments/pediatrics/divisions/gastroenterology/assets/default-profile-photo.jpg)
Stacy Matthews, M.D.
Education
B.S. (Cum Laude), Saint Louis Unversity, St. Louis, MO, 2016
M.D., Texas Tech University Health Sciences Center, Paul L. Foster School of Medicine, El Paso, TX, 2020
Postdoctoral Training
Saint Louis University, Cardinal Glennon Children's Hospital, St. Louis, MO, Pediatric Residency, 2020–2023
![Default Photo](/departments/pediatrics/divisions/gastroenterology/assets/default-profile-photo.jpg)
Sandra Ríos Meléndez, M.D.
Education
B.S. (Magna Cum Laude), University of Puerto Rico - Rio Piedras Campus, San Juan, PR, 2017
M.D. (Magna Cum Laude), University of Puerto Rico School of Medicine, San Juan, PR, 2021
Postdoctoral Training
Nicklaus Children's Hospital, Miami, FL, Pediatric Residency, 2021–2024
![Default Photo](/departments/pediatrics/divisions/gastroenterology/assets/default-profile-photo.jpg)
Alex Wright, M.D.
Education
B.S. (Summa Cum Laude), Texas A&M Unversity , College Station, TX, 2017
M.D., Unversity of Texas Medical Branch, Galveston, TX, 2021
Postdoctoral Training
UT Southwestern, Dallas, TX, Pediatric Residency, 2021–2024