Our fellows and faculty foster a collegial environment and education-focused culture that provides an inclusive learning experience. Training can be challenging, but our program is close-knit and each resident brings a dedication to providing stellar patient care as well as a collaborative learning experience.

Meet our current fellows in the Gastroenterology Fellowship at Mayo Clinic in Scottsdale and Phoenix, Arizona. 

Class of 2025

	Margaret Liu, M.D. Internal Medicine Residency location: Dartmouth-Hitchcock Medical Center, Lebanon, NH   I chose Mayo Clinic for my fellowship because of the stellar patient-centered clinical training, breadth of GI pathology, innumerable research opportunities and areas of collaboration with experts within every subspecialty of GI, opportunities for early career building, and the amazing and supportive gastroenterology and hepatology team I get to work with every day.
	Sean Sileno, M.D. Internal Medicine Residency location: Mayo Clinic in Jacksonville, FL   I chose Mayo Clinic for many reasons. For me, it started with the people. Prior to the application process, I was urged to apply here due to the reputation of the program, the success of previous residents from my residency program that had matched there, and its faculty. Once I got to my interview, I felt that the program was extraordinarily supportive and the goals for the fellows were in line with my personal goals. At my interviews, the faculty and chief fellows all made me feel comfortable and it was obvious that the program had a great culture that I felt that I would fit in with.
	Jaclyn Tuck, M.B., B.Ch., M.A. Internal Medicine Residency location: Mayo Clinic in Phoenix, AZ   I completed my residency here at Mayo Clinic, and from my first rotation with the GI division, I knew I wanted to stay here for fellowship. Between the collegiality among the fellows and staff, mentorship from world-class attendings, and exposure to a wide array of pathology, I knew Mayo Clinic would equip me with the skills I need to flourish in the field of gastroenterology. I feel so honored to train here and be part of the GI family. In addition, the vast expansion of Phoenix and its surrounding cities, has added to an already social and adventurous place to live.

Class of 2026

	Matthew Bell, M.D.   Internal Medicine Residency location: Mayo Clinic in Rochester, MN   I was born and raised in South Dakota. My undergraduate biology degree is from Augustana University (Sioux Falls, SD) and I went to medical school at the University of South Dakota. My IM residency was completed at Mayo Clinic in Rochester, Minnesota. I am married to my high school sweetheart, Jaime, who is a PA and will be working in cardiology at Mayo Clinic in Phoenix, Arizona. starting in July. In my free time, I love to be outdoors fishing, hunting, skiing, and hiking. I am very excited to be starting my fellowship with Mayo Clinic Arizona. I was drawn to this program by the wonderful faculty I met during my interview and by the obvious dedication to excellence this institution embodies. Thank you for welcoming me and I look forward to getting to know everyone over the next three years.
	Bridgette McNally, D.O.   Internal Medicine Residency location: University of Arizona College of Medicine, Phoenix, AZ   My name is Bridgette McNally, and I am from Lone Tree, CO. I completed my medical school at the Arizona College of Osteopathic Medicine at Midwestern and my residency training at the University of Arizona College of Medicine - Phoenix. I enjoy spending time with my family and dogs, competitive swimming, ZUMBA, baking, singing, arts and crafts, and spending time outdoors. I am passionate about GI, and I am particularly drawn to the combination of acuity/chronic disease, inpatient/outpatient practice, and procedures. I chose to complete my Gastroenterology fellowship at the Mayo Clinic in Phoenix, Arizona, because I knew that the professional, collegial, and excellent academic environment would allow me to reach my potential as a future Gastroenterologist/Hepatologist while continuing to grow as a physician who exemplifies academic excellence and patient care.
	Fangfang Wang, M.D.  Internal Medicine Residency location: Mayo Clinic in Phoenix, AZ   I grew up in Hohhot, China, and completed medical school at the University of Nebraska Medical Center. My passions lie in improving outcomes for patients with esophageal disorders and quality improvement in all aspects of GI practice. In my free time, I enjoy spending quality moments with my family, friends, and beloved pets amidst the breathtaking outdoors of Arizona. I chose to pursue a GI fellowship at Mayo Clinic in Phoenix, Arizona, because of the opportunity to work with complex patients, learn from exceptional mentors, and thrive in a collegial environment.
	Astin Worden, M.D.  Internal Medicine Residency location: Indiana University School of Medicine, Indianapolis, IN   I am a Phoenix native and U of A Wildcat and have made it back to my hometown after completing medical school and residency at Indiana University. I enjoy spending time with my husband, two young children, and Pomeranian, Charlie. I am excited to begin my fellowship at Mayo Clinic in Phoenix, Arizona, and I look forward to learning from leaders in the field.

Class of 2027

	Hally Chaffin, M.D. Internal Medicine Residency location: Mayo Clinic Arizona Just prior to the GI fellowship, Dr. Chaffin finished a year as Special Clinical Fellow (Chief Resident) here at Mayo Clinic Arizona. "I chose Mayo Arizona GI and Hepatology because of the supportive, expert faculty, broad exposure to subspecialties, and 300 days of sunshine per year.
	Clara Nguyen, M.D. Internal Medicine Residency location: Oregon Health and Science University   I wanted to be back in the sun and around family, a significant draw to the Mayo Clinic AZ GI Fellowship program. With my interest in Transplant Hepatology, Mayo Clinic’s expansive transplant program sealed the deal.
	Stacey Rolak, M.D. Internal Medicine Residency location: Mayo Clinic Rochester   I chose Mayo Clinic Arizona because of the collegial academic environment, the opportunities for subspecialty exposure and research, the chance to learn from leaders in GI, and the beautiful location close to loved ones.
	Archna Patel, M.D. Internal Medicine Residency location: Mayo Clinic Arizona   I am honored to be able to stay at MCA for my GI training because of the close relationships I have come to forge with the GI trainees and faculty. I know I will not only receive the best education possible here, but I also know I will receive it from faculty vested in our professional goals and personal well-being and from support staff who take extra care to make sure we have the building blocks to be successful.

Alumni

The most important indicator of the success of a training program is found in the outcomes of the graduates upon completion of their training. See where our recent graduates have taken their talents.