Providers


Harpreet S. Brar, MD

Education: Spartan Health Science University School of Medicine
Residency: University of Washington
Fellowship: University of Washington
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Brar began his GI career here in Olympia in 1999. He is well-known around the practice for his continual monitoring of all things newsworthy. This love of staying informed translates into Dr. Brar’s practice of medicine as he utilizes and shares the latest recommendations in evidence-based medicine with his patients, staff and peers.


Mark D. Cumings, MD

Education: Joan C. Edwards School of Medicine at Marshall University
Residency: Tripler Army Medical Center
Fellowship: Walter Reed National Military Medical Center
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Cumings is a retired United States Army Colonel and was Gastroenterology Services Chief at Madigan Army Medical Center before retiring from military service and joining our practice in 2015. His GI career began in 2002 and has taken him all over the world. Dr. Cumings enjoys spending much of his time off boating, fishing and shrimping on local waters.


Rodney W. Joe, MD

Education: University of Washington + University of Utah School of Medicine
Residency: University of Washington
Fellowship: University of Washington
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Joe’s GI career started here in Olympia in 1997. He recently completed an MS in Healthcare Administration from University of Washington to expand his knowledge in healthcare management. Dr. Joe is well known for his easy-going style, including no neck ties from Memorial Day to Labor Day. He also facilitated a collaboration between GA and Harley-Davidson for a very popular “check your tailpipe” Colon Cancer Awareness month campaign.


Lucas R. Leonard, MD

Education: University of Illinois College of Medicine
Residency: Tripler Army Medical Center
Fellowship: San Antonino Uniformed Health Services Consortium
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Leonard began his GI practice in Fort Campbell, Kentucky, in 2014 and transferred to Madigan Army Medical Center in 2017, beginning weekend work with GA at the same time. Dr. Leonard finished his military service in December 2019 and we are thrilled to have him onboard at GA full time.


Benjamin F. Merrifield, MD

Education: Case Western Reserve University School of Medicine
Residency: Brigham and Women’s Hospital
Fellowship: Brigham and Women’s Hospital/Harvard Medical School
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Merrifield began his GI career with GA in Olympia in 2005. Now he provides hospital coverage for GA a portion of each month. He also is a medical device inventor and is typically juggling several entrepreneurial projects at once.


David J. Owens, MD

Education: University of Washington School of Medicine
Residency: University of Washington
Fellowship: University of California, San Diego
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Owens started his GI career in his hometown, Olympia, in 2009 after completing an additional year of GI fellowship to specialize in advanced GI technologies. Since then he has provided specialized advanced procedure services, such as Endoscopic Ultrasound, to our community.


Bruce A. Silverman, MD

Education: Columbia University + Rush Medical College
Residency: Cedars-Sinai Medical Center
Fellowship: University of Washington
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Silverman completed his medical degree after earning an MS in Human Nutrition from Columbia University. His interest in nutrition has developed into a distinct interest in and avid investigation of the research being done on the human microbiome and he speaks frequently on this topic. Dr. Silverman’s GI career began in Olympia in 1988.


Kathryne A. Wagner, MD

Education: University of Washington Medical School
Residency: University of New York, Syracuse
Fellowship: University of New York, Syracuse
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Wagner began her GI career in Olympia in 1992 after returning to her PNW home from Syracuse, New York. Dr. Wagner believes in a maintaining a green, healthy and active lifestyle. She can frequently be found enjoying raw vegetables and has successfully completed the Seattle-to-Portland bike ride in one day!


Nicholas K. Weber, MD

Education: University of Kentucky
Residency: University of Colorado
Fellowship: Mayo Clinic
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Weber began his GI career in the south Puget Sound region in 2014, joining GA in 2017. He fits right in to the GA team with his intense focus on providing the highest quality, compassionate care to his patients.


Meimin Xie, MD

Education: Iowa State University + Beijing Medical University
Residency: Saint Barnabus Medical Center, New Jersey
Fellowship: Brigham and Women’s Hospital
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Xie (pronounced “see ya”) completed her medical degree after earning an MS in Molecular Biology from Iowa State University. She began her GI career here in Olympia in 2007. Dr. Xie is an active bicyclist and reminds us to share the road!


Kristine Y. Zhang, MD

Education: University of Minnesota School of Medicine
Residency: University of Washington
Fellowship: University of Washington
Board Certified in Gastroenterology by the American Board of Internal Medicine (ABIM)

Dr. Zhang left her Midwest roots to start her GI career here in Olympia in 2008. She, along with many of our physicians, balances a busy family life with her calling to be a physician.


Advanced Practice Providers:

ARNPs/PA-Cs:

Stephanie F. Mitchell, ARNP

  • Board Certified by the American Academy of Nurse Practitioners (AANP)
  • Education: Regis College, Master of Science degree in Nursing (MSN), Family Nurse Practitioner, following a Bachelor of Arts degree in History from the University of Portland

  • Victoria M. Moore, PA-C

  • Board Certified by the National Commission on Certification of Physician Assistants (NCCPA)
  • Education: University of Washington MEDEX Northwest Physician Assistant Program following a Bachelor of Science degree in Clinical Science from San Francisco State University

  • Stephanie A. Romine, ARNP

  • Board Certified by the American Academy of Nurse Practitioners (AANP)
  • Education: Seattle University, Master of Science Degree in Nursing (MSN), Adult-Gerontology Nurse Practitioner

  • Kimberly J. Thomas, ARNP

  • Board Certified by the American Academy of Nurse Practitioners (AANP)
  • Education: University of New Hampshire, Master of Science in Nursing (MSN), Family Nurse Practitioner

  • Janelisa K. Williams, PA-C

  • Board Certified by the National Commission on Certification of Physician Assistants (NCCPA)
  • Education: University of Washington MEDEX NW Physician Assistant Program following a Bachelor of Science degree in Microbiology from the University of Washington

  • Contact Us

    Our Locations

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    Hours of Operation

    Our Regular Schedule

    Map and Location

    Monday:

    7:30 am-5:00 pm

    Tuesday:

    7:30 am-5:00 pm

    Wednesday:

    7:30 am-5:00 pm

    Thursday:

    7:30 am-5:00 pm

    Friday:

    7:30 am-5:00 pm

    Saturday:

    Closed

    Sunday:

    Closed

    GA Endoscopy Center

    Hours of Operation

    Our Regular Schedule

    Map and Location

    Monday:

    6:45 am-5:15 pm

    Tuesday:

    6:45 am-5:15 pm

    Wednesday:

    6:45 am-5:15 pm

    Thursday:

    6:45 am-5:15 pm

    Friday:

    6:45 am-5:15 pm

    Saturday:

    Closed

    Sunday:

    Closed

    Providence St. Peter Hospital Endoscopy Center