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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.

Mission Statement

Provide the highest quality, patient centered, cost effective, health care to the community we serve.

Vision Statement

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

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.


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

Cascade Health Solutions
Sacred Heart Medical Center
Therapeutic Associates Physical Therapy

Clinic 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.
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. In her personal time, Dr. Miller enjoys hiking, camping, biking, traveling around the world, and learning about new cultures.
Amy McCarthy, MD
Dr. McCarthy earned her medical degree from Oregon Health and Science University in 1992. She completed her internship and residency at the MetroHealth Medical Center in Cleveland, Ohio. Dr. McCarthy is board certified in obstetrics/gynecology.
Bill Hinz, MD
Dr. Hinz earned his medical degree in 2006 from the University of Utah. He also completed his residency from the University of Utah (Rheumatology). Dr. Hinz 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.
Marissa Simard, MDMarissa Simard, MD
Dr. 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...  read more
William Balsom, MD
Dr. Balsom 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.
Jessica Versage, MD
Dr. Jessica Versage joined Oregon Medical Group in January 2012. Dr. Versage earned her medical degree from University of Florida College of Medicine in Gainesville, Florida. She completed her residency at Mountain Area Health Education Center in Asheville, North Carolina. Her medical areas of interest include family planning, routine and high risk pregnancy, minimally invasive gynecologic surgery...  read more

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.

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.

OMG dermatology welcomes Blake Sampson, MD

Oct 26, 2018
We’re pleased to welcome Blake Sampson, MD, to Oregon Medical Group. Dr. Sampson will see patients and conduct dermatological surgical procedures at Gateway Medical Clinic. Dr. Sampson earned a medical degree from the University of Washington School of Medicine in Seattle. He completed residency training .... read more