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About Us



Oregon Medical Group is a primary care based, multispecialty physician group with offices throughout the Eugene/Springfield area. Our group consists of internists, family practitioners, pediatricians, obstetricians / gynecologists and specialists including orthopedics, otolaryngology, endocrinology, gastroenterology, pain management, podiatry, rheumatology, dermatology, sports medicine and neurology. We have a wide variety of ancillary services to support efficient patient care and access, including laboratory, diagnostic imaging, a women's breast health center (Cedar Clinic), infusion services, anticoagulation, audiology, physical therapy and travel medicine.

Our group was formed in 1988 with the principle that physician control and direction is essential for the provision of high quality medical care. In addition, we believe that being in a group practice allows for greater continuity of patient care than in other types of practices. We strive to attract the brightest and best-trained physicians within each specialty of the practice. We encourage their pursuit of continuing education to provide patient care based on the most current and innovative accepted practice standards. Our physicians maintain a positive working relationship with both of the area's hospitals, Sacred Heart Medical Center and McKenzie-Willamette Medical Center. Collectively, these organizations provide the full spectrum of health-related hospital services throughout the Lane County area.

Our medical practice is governed by Clinic Directors, comprised of physicians.

Our Mission

We collaborate to provide the highest quality, patient-centered care.

Our Vision

Together, we help you live your healthiest life.

Our Values

Servant leadership

We provide compassionate care and service that is community-centered and patient-focused.


We hold ourselves and each other accountable to the highest standards of excellence, integrity, trustworthiness, and mutual respect.


We promote fiscally sound business practices that support continuous improvement, adaptability and work-life balance.


Karen Weiner, MD, CEO
Karen Weiner is our Chief Executive Officer. Dr. Weiner earned her medical degree from the University of Southern California and completed her pediatric residency at OHSU Doernbecher Children's Hospital in Portland, Oregon. She earned her Master’s degree in Medical Management from the USC School of Business.  Dr. Weiner practiced primary care pediatrics with OMG for 16 years, served on the board of directors for six years and as the Chief Medical Officer for four years prior to being promoted to the Chief Executive Officer role in 2017.  Her focus in leadership includes facilitating cultural transformation in healthcare to best serve patients, improve the health of the community and allow care-providers to find work/life balance.

Don Costa, CFO
Don Costa is our Chief Financial Officer. Don has extensive financial, operational and administrative management healthcare experience serving in various roles prior to joining Oregon Medical Group. He has been the CEO, CFO, CAO, and Controller of various health plans in California, Washington and Oregon, was a healthcare audit Principal with a national CPA firm, and has held financial management roles in the personnel, real estate and legal services industries. Don is a CPA and graduated from Indiana University.

Eve Riley, COO
Eve Riley is our Chief Operating Officer. She is a master’s prepared nurse who was brought into the organization in May 2015 to develop the Quality and Patient Safety program for Oregon Medical Group. Since that time she has developed a vision and the start of a population health program to drive transformational outcomes, including organizational 4 and 5 star designation by various Medicare Advantage programs. Over the past year, Eve has introduced the Daily Management System (DMS) into our organization to support continuous performance improvement. Prior to joining Oregon Medical Group Eve spent 15 years combined as an RN in Emergency Medicine and Labor and Delivery. Additionally, Eve has 11 years of combined experience in clinical operations leadership in a medical group, network and systems of care settings. She has a deep understanding of the application of lean principles within healthcare and has provided consultative services to hospital and ambulatory care organizations. In her free time, Eve enjoys outdoor activities with her husband and two sons.

Stacy Chance MD, CMO
Dr. Stacy Chance has been with Oregon Medical Group since 2006 and has been on the Board since 2013. He was appointed Executive Medical Director in June 2017 and Chief Medical Officer in March 2019. He has served in many leadership roles over the years, including chairing the operations committee, serving as department chair for adult primary care, and Physician Practice Leader (PPL) of Garden Way Medical Clinic. He earned a medical degree from Vanderbilt University School of Medicine and completed residency training at the University of Rochester Strong Memorial Hospital. He is board certified in pediatrics and internal medicine and his areas interest include preventative care, children with special needs and sports physicals.


Taking care of our community is a big job and we're proud to have associates who share our commitment

Therapeutic Associates Physical TherapySacred Heart Medical CenterMcKenzie-Willamette

Board Members

Gary Brandt, MD
Dr. Brandt earned his medical degree from Howard University in Washington, D.C. in 1985. He completed his internship and residency at San Bernardino County Medical Center (UCLA) in California. Dr. Brandt is board certified in family medicine. Click here to view Dr. Brandt's full bio.

William Balsom, MD
Dr. Balsom joined Oregon Medical Group in in September 1996. Dr. Balsom on earned his medical degree from the University of Washington School of Medicine in 1990. He completed his internship and residency at Providence Family Practice in Seattle, Washington. Dr. Balsom is board certified in family medicine. In his personal time, Dr. Balsom enjoys music, hiking, and literature. Dr. Balsom is fluent in Spanish. Click here to view Dr. Balsom's full bio.

Jessica Ellis, MD
Ellis earned her medical degree from University of Iowa in 2002.  She completed her residency at Genesis Quad Cities in Davenport, Iowa.  Prior to joining Oregon Medical Group, she worked in Bettendorf, Iowa for nine years as a primary care sports medicine physician.

Her medical areas of interest include overuse and acute injuries involving the muscle, bone, tendon or ligaments in the active population, non-operative fracture care, symptom management for osteoarthritis, decision making in regards to return to play decisions in the competitive athlete, issues unique to endurance and throwing abilities, ultrasound-guided injections, exercise as medicine and preventing future injuries by addressing correctable risk factors. Click here to view Dr. Ellis' full bio.

Geoffrey Gill, MD
Dr. Geoffrey Gill joined Oregon Medical Group in September 2007. Dr.Gill joined Oregon Medical Group in 2007.  After graduating with a degree in Chemistry from Creighton University in 1997, he continued his education at the Creighton University School of Medicine.  He went on to complete his training in Obstetrics and Gynecology at the University of New Mexico in Albuquerque, New Mexico.

Dr. Gill believes strongly in evidence based medicine, but also realizes “one size does not fit all.”  He believes that the best treatment plan for his patients starts with first establishing the end goal of the therapy.  From there, he enjoys the path of helping his patients determine what course of action is going to be best for them. Click here to view Dr. Gill's full bio.

Bill Hinz, MD
Dr. Bill Hinz joined Oregon Medical Group in October 2011. Dr. Hinz completed his medical degree in 2006 as well as his residency in rheumatology from the University of Utah. Dr. Hinz's medical areas of interest include rheumatoid arthritis, soft-tissue injuries and ultrasound. In his personal time, he enjoys college football, sports, board and card games. Click here to view Dr. Hinz's full bio.

Amy McCarthy, MD
Dr. Amy McCarthy joined Oregon Medical Group in August 1996. Dr. McCarthy earned her medical degree from Oregon Health and Science University (OHSU) in 1992. She completed her internship and residency at the MetroHealth Medical Center in Cleveland, Ohio and also did surgical rotations at the Cleveland Clinic. Dr. McCarthy is board certified in obstetrics/gynecology. In her personal time, she enjoys traveling and camping throughout the Northwest with her family. Dr. McCarthy is an avid Oregon State Beavers sports fan and her favorite color is orange! Click here to view Dr. McCarthy's full bio.

Shadi Miller, MD
Dr. Miller earned her medical degree from the University of California, San Diego in 1999. She completed her residency for combined Internal Medicine and Pediatrics at the University of Michigan and St. Joseph Mercy Hospital in Ann Arbor, Michigan. Dr. Miller is board certified in Internal Medicine and Pediatrics. Dr. Miller went into the medical field to help each of her patients develop healthy habits with the hopes of having healthier communities. Dr. Miller most enjoys developing long-term relationships with patients and helping them with the prevention and treatment of illness. She values providing evidence-based medicine in an environment that respects her patients' choices. Dr. Miller's medical interests include preventative medicine for adults and children, treating chronic illness such as diabetes, HTN, high cholesterol, asthma, eczema and care of families. In her personal time, Dr. Miller enjoys hiking, camping, biking, traveling, reading and being outdoors with her family. Click here to view Dr. Miller's full bio.

Marissa Simard, MD
Marissa Simard joined Oregon Medical Group in August 2013. Dr. Simard was born and raised in Eugene. As a radiologist, she greatly values opportunities to interact directly with patients in the Cedar Clinic and during image guided procedures. Additional areas of interest include abdominal imaging and women's imaging. In her personal time, Dr. Simard enjoys getting outside, hiking, biking and gardening with her husband. Click here to view Dr. Simard's full bio.

Community Board Members

Noreen Dunnells, Community Board Member
Elected in 2018, Noreen Dunnells joins the OMG board of directors. Noreen has served as President and CEO of United Way of Lane County since February 2012 and has over thirty-one years of experience with United Ways across the country.“Noreen is a great addition to the OMG board,” says chair Gary Brandt, MD. “Her experience and commitment to our community aligns with our values of Servant Leadership, Professionalism and Sustainability.”In addition to her work with United Way, Dunnells serves on a variety of community boards including: Poverty and Homelessness Steering Committee, Connected Lane County, the Lane Workforce Council Board, the Eugene Chamber Economic Development Council and a member of the downtown Rotary club. She also serves as the Board chair of the United Ways of the Pacific Northwest.

Jenny Ulum APR, Community Board Member
Jenny was recently honored as Eugene’s First Citizen for her decades of business, community and health care leadership. She specializes in managing communications for complex issues, particularly in the public policy arena. She is the Senior Director of Communications for King Estate Winery and the Public Affairs Council for 5th Street Public Market in Eugene. Prior to these roles she was the Director of Public Affairs and Advocacy for PeaceHealth and founder of the Ulum Group. Before founding The Ulum Group she led community and government relations at PeaceHealth, which included Sacred Heart Medical Center and PeaceHealth Medical Group in Eugene. Her career began as a legislative aide in the 1979 Oregon Legislature, and she also worked in public relations for the University of Washington Health Sciences Center and Bellevue (Wash.) Public Schools. She has served as board chair for the Eugene Area Chamber of Commerce and as president of the Greater Oregon Chapter of the Public Relations Society of America. She is past president of the United Way of Lane County board of directors and on the board for the Relief Nursery, University of Oregon Alumni Association and Oregon Public Broadcasting. She holds undergraduate degree is in communications and sociology from Linfield College, and a Master's degree in journalism from the University of Oregon.

Community Involvement

Oregon Medical Group is committed to providing exceptional care to our community through our involvement with these volunteer agencies:

  • Affair of the Heart
  • Habitat For Humanity
  • Food For Lane County
  • Volunteers In Medicine
  • United Way
  • 100% Access Coalition
  • American Cancer Society
  • American Diabetes Association
  • Whitebird Clinic
  • Susan G. Komen
  • Relay For Life
  • Kid Sports
  • Cascade Medical Team
  • Lane Community College Phlebotomy & Medical Assisting Programs
  • Festival of Trees
  • Oregon Track Club Elite (sports physicals)
  • Riverstone Clinic

Patient Testimonials

Read what our patients are saying about us.

“Thank you to Dr. Susan Urben and the Front and Back Office Staff at ENT.  You are all so kind, compassionate and knowledgeable!  I feel like I am in great hands when I come to your office!”

“Dr. Katria Mertz is the best doctor I have gone to in all my 80 years of life!”

“Thank you to all the doctors at Oregon Medical Group for the wonderful care I have received!”

"I've been a patient at OMG for 20+ years of my life and have seen Dr. Bonnie Pollack at Southtowne for the past 4+ years. The staff has been nothing short of helpful, kind, and accommodating. I recommend them to anyone. 


Our physicians are available to reporters and editors to offer expert commentary and opinions on medical issues. To arrange for an interview, please contact info@oregonmed.net.

NOW Immediate Care Clinic open Labor Day

Aug 30, 2019
If you need us this Labor Day weekend, we have a team ready at the NOW Immediate Care Clinic on Crescent Avenue. Please note that our NOW Clinic on Willamette is closed on Labor Day. NOW Immediate Care at Crescent Medical Clinic 2830 Crescent Avenue .... read more