Specialties
Gastroenterology and Hepatology
Our Fellows and Faculty
Four fellows are selected each year based upon their clinical performance, scholarly accomplishments, and potential to become outstanding gastroenterologists and hepatologists.
Current Fellows
Astred Castro
Medical School: University of California, Davis
Internal Medicine Residency: University of California, Davis
Rhett Harmon
Medical School: University of Nevada School of Medicine
Internal Medicine Residency: David Geffen School of Medicine at UCLA - Olive View
Joanna Lin
Medical School: California College of Osteopathic Medicine of the Pacific at Pomona
Internal Medicine Residency: University of San Francisco, Fresno
Aida Nasirishargh
Medical School: University of California, Davis
Internal Medicine Residency: University of California, Davis
Alexander Chen
Medical School: Rutgers University Robert Wood Johnson Medical School
Internal Medicine Residency: Rutgers University Robert Wood Johnson Medical School
Jose Martinez Perez
Medical School: Chicago Medical School at Rosalind Franklin University
Internal Medicine Residency: University of California, Davis
Lindsay Valenti
Medical School: University of California, Davis
Internal Medicine Residency: University of California, Davis
Sandy Vien
Medical School: Loyola University Chicago Stritch School of Medicine
Internal Medicine Residency: University of California, Davis
Nicole Bernstein
Medical School: Drexel University School of Medicine
Internal Medicine Residency: University of California, Davis
Samuel Ji
Medical School: Touro University College of Osteopathic Medicine
Internal Medicine Residency: University of California, Irvine
Joseph Toth
Medical School: State University of New York Upstate Medical University
Internal Medicine Residency: University of California, San Diego
Cathy (Lankai) Xu
Medical School: Oregon Health Sciences University School of Medicine
Internal Medicine Residency: University of California, Davis
Former Fellows
Jacqueline Chang
Medical School: Sidney Kimmel Medical College at Thomas Jefferson University
Internal Medicine Residency: Oregon Health and Science University
Robert Pecha
Medical School: University of Kentucky College of Medicine
Internal Medicine Residency: Baylor College of Medicine
Yesenia Ramos
Medical School: University of Washington School of Medicine
Internal Medicine Residency: University of California, Davis
Charles Lavender
Medical School: University of Arkansas for Medical Sciences
Internal Medicine Residency: University of Arkansas Medical Center
Shannon Schroeder
Medical School: Wake Forest University School of Medicine, Winston-Salem, North Carolina
Internal Medicine Residency: University of California, Davis
Omar Viramontes
Medical School: David Geffen School of Medicine at UCLA
Internal Medicine Residency: University of California, San Francisco
Bao Sean Nguyen
Medical School: Keck School of Medicine, Los Angeles
Internal Medicine Residency: University of California Los Angeles
Christine Shieh
Medical School: David Geffen School of Medicine at UCLA
Internal Medicine Residency: Thomas Jefferson University, Philadelphia, PA
Alex Zhornitskiy
Medical School: Drexel University College of Medicine, Philadelphia PA
Internal Medicine Residency: University of California, Los Angeles
Alex Miller, M.D.
Medical School: University of Utah School of Medicine
Residency: Mayo Clinic, Rochester, MN
Cindy Piao, M.D.
Medical School: Boston University School of Medicine
Residency: UC Davis School of Medicine
Shivani Shah, M.D.
Medical School: George Washington University School of Medicine and Health Sciences
Residency: Yale New Haven Hospital
Runalia Bahar, M.D.
Medical School: University of Pittsburgh School of Medicine
Residency: UC Davis School of Medicine
Stephanie Yan, M.D.
Medical School: Georgetown University School of Medicine
Residency: UC Davis School of Medicine
Jeffrey Ko, M.D.
Medical School: Saint Louis University School of Medicine
Residency: Cedars-Sinai Medical Center
| Class of 2021 | Where Are They Now? |
| Sirisha Grandhe, M.D. | Washington Gastroenterology |
| Sheeva Johnson, M.D., M.P.H. | Kaiser South Sacramento |
| Justin Louie, M.D. | Kaiser Modesto |
| Class of 2020 | Where Are They Now? |
| Abhinav Koul, M.D. | UC Davis Advanced Endoscopy Fellowship Program |
| Alex Kuo, M.D. | UC Davis Medical Center |
| Dana Pan, M.D. | Insite Digestive Health |
| Class of 2019 | Where Are They Now? |
| Armen Eskandari, M.D. | UC San Diego Advanced Fellowship Program |
| Amir Taefi, M.D. | Kaiser South Sacramento |
| Laura Pestana, D.O. | Adventist Health, Ukiah, CA |
| Class of 2018 | Where Are They Now? |
| Joseph Marsano, MD | UC Davis Medical Center |
| Sital Singh, MD | Lodi Memorial Hospital, Lodi, CA |
| Patrick Koo, MD | Fullerton, CA |
| Class of 2017 | Where Are They Now? |
| Robert Levy, M.D. | Kaiser South Sacramento |
| Victoria Yung, M.D. | John Muir Health |
| Andrew Chao, M.D. | Kaiser South Sacramento |
Our Faculty & Attendings
UC Davis Health
- Christopher Bowlus, M.D. – Professor, Division Chief
- Maria Aguilar, M.D. – Assistant Professor
- Amar Al-Juburi, M.D. - Professor
- Lydia Aye, D.O. – Associate Professor, Medical Director of Transplant Hepatology
- Maneesh Dave, M.D., M.P.H – Professor
- Piyush Dhanuka, M.D. – Assistant Professor
- Albert Do, M.D., M.P.H – Associate Professor
- Juan Carlos Garcia, M.D. – Professor, Clinic Medical Director
- Andrew Gilman, M.D. – Assistant Professor
- Ronald Hsu, M.D. - Professor
- Hisham Hussan, M.D. – Associate Professor
- Jeffrey Ko, M.D. – Assistant Professor, Associate Program Director
- Michael Lawson, M.D. – Volunteer Clinical Professor
- Lien Le, M.D. – Associate Professor
- Valentina Medici, M.D. – Professor, Vice Chair for Research
- Antonio Mendoza Ladd, M.D. – Professor, Director of Endoscopy
- Vikrant Rachakonda, M.D. – Associate Professor, Fellowship Research Director
- Jesse Stondell, M.D. - Associate Professor, Fellowship Program Director
- Kuldeep Tagore, M.D. – Associate Professor
- Cecilia Terrado, M.D. – Professor, Vice Chief for Clinical Operations
- Cara Torruellas, M.D., M.P.H. - Associate Clinical Professor
- Shiro Urayama, M.D. – Professor, Advanced Endoscopy Fellowship Program Director
- Anastasia Waechter, M.D. - Staff Physician
- Kimberly Wong, M.D. – Associate Professor, Quality and Safety Committee Chair
- Alex Zhornitskiy, M.D., M.P.H. – Assistant Professor, Global Health Liaison
Mather V.A.
- Andrew Yen, M.D. – GI Section Chief
- Randall Lee, M.D. – VA Liaison to UC Davis GI Fellowship
- Joseph Leung, M.D. – Professor Emeritus
- Eugene Chan, M.D.
- Mai Sedki, M.D., M.P.H.
- Vikrant Rachakonda, M.D.
- Homayoun Shojamanesh, M.D.