About Dr. Ohara


Jun-Ichi Ohara, MD, PhD


TEL:   (949)654-8963                                                                                      

Practicing in Orange Country since 1996


  • Internal Medicine
  • Gastroenterology
  • GI Endoscopies

Hospital privilege

      . Hoag Hospital Irvine/Newport Beach  (www.hoag.org)

      . St. Vincent Hospital in Los Angeles     (www.stvincentmedicalcenter.com)

Education/Training Institution
Medical School (MD)
Okayama University School of Medicine, Japan
Professional School (PhD) Osaka Unversity School of Medicine, Japan

Presbyterian/St. Luke's Medical Center, Denver, CO

Residency Presbyterian/St. Luke's Medical Center, Denver, CO
Fellowship University of Colorado Health Sciences Center

American Board Certified Gastroenterology and Hepatology (ABIM)


I grew up in a family in which many became physicians or surgeons. Therefore it was a natural course for me (as well as my parents' expectation) that I would be a medical doctor in future. However, after learning medicine under many excellant teachers and admirable role models in Okayama University School of Medicine in Japan, I was conflicted about whether I should become a researcher in medical sciences or a clinical practioner.


I was fortunate to be able to start my post-graduate training as a Ph.D. student in the 3rd department of Internal Medicine of Osaka University School of Medicine immediately after graduating from Okayama University School of Medicine and earning a M.D. degree. The 3rd department of Internal Medicine, lead by Professor Yu-Ichi Yamamura, was very unique and very progressive in bridging clinical medicine and basic medical research. As a Ph.D. student in the department of Internal Medicine I was trained to become an internist as well as a researcher in medical science. I earned my Ph.D. degree in allergy and immunology fields after 4 years, and then extended my clinical experience as an internist at Osaka Prefectural Habikino Hospital. Then I became an instructor on basic medical research in the department of immunology at Saga Medical College.


In 1983, I had an opportunity to join the cytokine research of B-Lymphocyte Stimulating Factor (which was later re-named to interleukin-4 (IL-4)) at National Institutes of Health (Laboratory of Immunlogy, National Institues of Allergy and Immunology Reseaches). I was fortunate to contribute more than 30 research publications in Nature, Proceeding of National Academy of Sciences (PRONAS USA), J. of Experimental Medicine (Rockefeller University, NY), J. of Immunology, etc either as a first author or co-auther during my 6 years at N.I.H. I was also a co-author of Annual Review of Immunology (Palo Alto 1987).


As a research associate professor at Department of Internal Medicine, Gastroenterology division, in University of Colorado Heath Sciences Center, Denver, Colorado I continued to research and published our findings in Immunogenetics (in 1991). At the same time I was able to complete intern and resident training in internal medicine and clinical fellowship in gastroenterology, and earned physician licensures for the State of California, American Board Certification of Internal Medicine, Board Eligibility of Gastroenterology, and then American Board Certification of Gastroenterology.


I started a medical practice in southern California in 1996 and built Odyssey ASC Endoscopy Center in 2010 which is located in city of Irvine, just a few minutes south of the Great Park (former El Toro air field).


I am currently practicing gastroenterology, and am medical staff at Hoag Hospital. My mission is to provide even more compassionate and high quality medical care.