Chief Medical Officer

Dr. Ty Witt is a gynecologist with over 30 years of experience in women’s health. Throughout his career Dr. Witt has delivered more than 4,000 babies, but for the past several years he has focused on gynecology. He is certified by the American Board of Obstetrics & Gynecology.

Dr. Witt has extensive surgical expertise and stays up-to-date on the newest, most minimally invasive procedures to help women heal with less pain and recovery time. He specializes in women’s health issues, including bone health, hormonal issues, heavy bleeding, urinary incontinence, and infertility.

He is originally from the Pacific Northwest, and has run private practices in Arizona and Oregon. He studied at UCLA Medical School and completed his residency at Oregon Health & Science University.

Surgical Capabilities:  Hysteroscopy, hysteroscopic ablations, laparoscopy for pelvic pain, masses and cysts, repair of pelvic and vaginal relaxation, laparoscopic assisted and abdominal hysterectomies, infertility, EPCT, IUI, HSG, IUD, LEEP, core biopsy, vaginal rejuvenation with posterior colporrhaphy and labioplasty.

For more information or to make an appointment, please call 509-689-3749.

Medical Staff President
Family Practice

Dr. Amy Ellingson is a longtime local family practice physician who joined Three Rivers Family Medicine on August 26, 2019. In January 2021, she was elected the  Medical Staff President for Three Rivers Hospital and Three Rivers Family Medicine by the Medical Staff Committee.

Dr. Ellingson has been working in North Central Washington since 2002 as an outpatient and inpatient family medicine doctor. Dr. Ellingson speaks Spanish fluently and specializes in disease prevention, healthy lifestyles, and Bio-Identical Hormone Replacement Therapy. She also practiced surgical obstetrics until 2015.

Dr. Ellingson is certified by the American Board of Family Medicine and is a member of the American Academy of Family Medicine. She received a Bachelor of Arts degree in Sociology from the University of Notre Dame in South Bend, IN, and earned her Doctor of Medicine from Loyola University of Chicago. She completed her residency at the Montana Family Practice Residency Program.

Dr. Ellingson also serves as Medical Director of Touching Tiny Lives, led the Diabetes Smackdown series in Chelan, and created an NCWLife television program called “Live It Up.”

Dr. Ellingson sees patients from 9 a.m. to 5 p.m., Monday through Thursday. Same-day appointments may be available. For more information or to make an appointment, please call 509-689-3749.

Medical Staff Vice President
General Surgery


Dr. Rosie Dhillon, a board-certified general surgeon, joined the Three Rivers medical team on November 4, 2019. In January 2021, she was elected Vice President of Medical Staff for Three Rivers Hospital and Three Rivers Family Medicine.

Dr. Dhillon has studied at the world-renowned Mayo Clinic in Rochester, Minn., since 2012 and completed her five-year surgical residency there in 2019. She completed a year of additional surgical residency at Virginia Mason Medical Center in Seattle. She earned a Bachelor of Science degree in Cell and Molecular Biology from Simon Fraser University in Vancouver, Canada, before enrolling in the American University of the Caribbean School of Medicine in 2007 to receive her Doctor of Medicine degree.

Dr. Dhillon is an active member of the American College of Surgeons, the Association of Women Surgeons, Mayo Clinic Alumni Association and the Priestley Society. She earned several awards throughout her academic career and has published medical research and delivered lectures in San Diego, Florida, Seattle, and Minnesota.

Her focus is on laparoscopic procedures, emergent surgeries, and colonoscopies.

For more information or to make an appointment, please call 509-689-3749.

Emergency Medicine
ERx Site Manager

Dr. Huffman is one of our longstanding, dedicated emergency physicians through ERx Group, LLC. Beginning November 2020, Dr. Huffman, along with our other ERx providers, began attending to patients on our Acute Care floor as well. This ensures a seamless transition and high quality, standard care from admission to discharge. Dr. Huffman also stepped into the ERx site manager role for Three Rivers Hospital in January 2021.


Dr. Stephen White joined the Three Rivers team in July 2020, through a partnership with Mid-Valley Hospital & Clinic in Omak, WA. Dr. White has over 20 years of orthopedic experience. He attended medical school at the University of Utah and completed his residency at the University of Kansas. After five years in Kansas, he spent 17 years in Texas and Oklahoma. He is board certified by the American Board of Orthopedic Surgery. Dr. White loves the small town setting, where he feels that he can personally care for people with whom he lives and works. He practices general orthopedics with extensive experience with joint replacement, trauma and sports medicine.

Dr. White is dedicated to the latest advances in orthopedic surgery with frequent special training courses in joint replacement, joint revision, trauma, and sports. Other common procedures with which he has many years of experience are arthroscopic ACL and meniscal surgery (knee), arthroscopic shoulder surgery (including the rotator cuff and stabilizing ligaments), and endoscopic carpal tunnel surgery.

Even with his extensive surgical experience, Dr. White still treats most conditions without surgery. He enjoys educating patients and involving patients in their plan for treatment. Patient choice is very important to him and he feels that treatment should be individualized for everyone he sees.

Dr. White incorporates a holistic approach with mind, body and spirit. Scientific studies are showing the connections between stress, depression and disease and aging. Studies are explaining how prayer, optimism, connections with other people, compassion and mindfulness can all help improve outcomes and quality of life.

Dr. White lives in the Omak area with his wife and daughter.

For more information or to make an appointment, please call 509-689-3749.


Greg Fisk began his career in 2002 as a certified physician assistant with Family Psychiatrists, before moving to Omak in 2005. He worked with Caribou Trail Orthopedics for a number of years and provided ER call coverage for Three Rivers Hospital before accepting a position with Mid-Valley Medical Group. He re-joined the Three Rivers team with Dr. White in July 2020.

In addition to his cumulative 12 years of experience in orthopedics, Greg has also worked in mental health, emergency, and sleep medicine.

For more information or to make an appointment with Greg Fisk, please call 509-689-3749.

Family Practice/Orthopedics

Bob Brown, a certified Physician Assistant, joined our Three Rivers Family Medicine clinic full-time in November 2020. Bob has nearly 50 years of experience in health care, starting as a Physician Assistant-C in the U.S. Army Medical Corps. Throughout his career, Bob spent about 13 years working in our area. He provided emergency care at Three Rivers Hospital for 11 years, and he spent one year each working for Caribou Trail Orthopedics and Mansfield Clinic. His most recent position was with Beacon Occupational Health and Safety Services, where he provided primary and urgent care, occupational care, and emergency services.

In addition to his extensive experience, Bob is also certified by the Washington State Department of Transportation to provide physicals to workers obtaining their CDL license.

Bob studied pre-med at the University of Evansville in Indiana, then obtained his Physician’s Assistant degree from Baylor University in Fort Sam Houston, TX.

To make an appointment, please call 509-689-3749.