Biography

Dr. Yi JennyZheng M.D., Ph.D.

As a diplomate of the American Board of Internal Medicine as well as the American Board of Gastroenterology, Dr. Zheng is double board certified in Gastroenterology & Hepatology, as well as Internal Medicine.

Dr. Zheng's expertise in Gastroenterology and Hepatology developed during her time at USC, where she trained with world-renowned faculty like Dr. Loren Laine, President of the AGA (American Gastroenterology Association), and Dr. Neil Kaplowitz, past president of AASLD (American Association for the Study of Liver Disease), and author of the Textbook of Gastroenterology.

After ten years at Kaiser Permanente, the opportunity to work with a wide variety of patients from all backgrounds is what inspired Dr. Zheng to open her own practice.

As a firm believer in prevention, the focus of Dr. Zheng's practice is colon cancer/polyp screening, Barrett's esophagus, esophageal cancer screening and stomach cancer screening, as well as screening and prevention of fatty liver and cirrhosis.

Understanding that chronic digestive disease can severely impact a patient's ability to enjoy life, Dr. Zheng also makes forming close relationships with her patients a priority.

Dr. Zheng collaborates closely with referring primary care providers as well as colleagues from other specialties like endocrinologists, surgeons, oncologists and radiologists to support patients with complex conditions.

Experience, Education & Training

Prior Medical Practice Experience 2009-2019

Specialist, Gastroenterology and Hepatology,

Kaiser Permenate Medical Group

Clinical Training

2003-2009

Fellowship, Gastroenterology and Hepatology, University of Southern California, 2009

Residency, Internal Medicine, UCSD, 2006

Medical Research

1998-2003

Post-doctoral Researcher, UCLA School of Medicine

Medical Education 1988-1998

M.D., Ph.D. (Moledular Biology)

Tongji Medical University, China

Our Team

Daniel Zhu, B.S.

Office Manager, with us since 5/2020

Daniel studied business and data science at the University of California Berkeley’s Haas School of Business. He is an experienced social entrepreneur who is passionate about making healthcare accessible and equitable. Daniel's past consulting work included mental health systems-of-care for regional and state governments. Daniel is going to Stanford University for MBA in 2026.

Daniel is also fluent in Chinese (Mandarin)

Andrew Zheng

Office Assistant, With us since 5/2020

Andrew is a masterful writer. He started his high school speech and debate team and competed in national speech and debate tournaments with medals and trophies.

Andrew likes hiking, cross country, skiing and tennis.

Andrew is also fluent in Chinese (Mandarin)

Amber Van Deusen

Medical Assistant, intern, Joined us in 5/2024

Amber is an undergraduate student in Chico state U @ health major. She is interested in the medical field and plans to apply to nursing school.

Amber is fluent in Vietnamese.

Jeanne Erica Fresnido

Medical Assistant, Joined us in 5/2024

Jeanne is also fluent in Tagalog.

Katie Liang, BS

Medical Assistant, intern, Joined us in 7/2025

Katie is a recent graduate from the UC Berkeley, where she received her degree in Molecular Biology. Katie is interested in the medical field and is applying to medical school.

Katie is fluent in Chinese, mandarin.

Vicky Mei

Medical Assistant, intern, Joined us in 7/2025

Vicky is a recent graduate from the UC San Diego. Vicky is interested in the medical field and is applying to PA school.

Vicky is fluent in Chinese.

Mica Mendoza

Medical Assistant, intern, Joined us in 7/2025

Mica is a recent graduate from the UC Davis with a B.S in Human Biology and minor in Public Health. She is passionate about preventative healthcare and serving patients with the upmost care. Mica is interested in the medical field and is applying to medical school in the future.

Mica is fluent in Tagalog.

Leah Mari Bartolome

Medical Assistant, Joined us in 6/2025

Leah is an undergraduate student of Bachelor of Science in Architecture. Outside of my work, she enjoys drawing and exploring the outdoors during her free time.

Leah is also fluent in Tagalog.