Legacy Health Partners (LHP)

Delivering value and improving health

Board Members

The LHP Board of Managers develops and oversees the strategic direction of the network. The board oversees the work of the three board subcommittees and has final approval authority for all recommended actions put forth by the committees, including but not limited to, clinical integration program performance measures, contracts entered into on behalf of the network, data integration activities and population health services.

Chair: Gregory Saunders, M.D., LMG – Camas
Vice Chair: Damon Warhus, M.D., Women's Healthcare Associates

  • Nathan Bay, M.D., Silver Creek Family Medicine
  • Resa Bradeen, M.D., Metropolitan Pediatrics
  • Jennifer Byrne, D.O., Columbia View Family Health
  • Robert Fu, D.O., Pacific Medical Group
  • Anita Iyenger, Senior Vice President, Chief Strategy Officer, Legacy Health
  • Steve Mansberger, M.D., MPH, Glaucoma Associates and Consultation
  • Sharlene Mattheiu, M.D., East Portland Pediatric Clinic
  • Erika Moseson, M.D., LMG Pulmonary Care
  • Melinda Muller, M.D., Senior Vice President, Chief Medical Officer, Legacy Health
  • Richelle Neal, M.D., Olson Pediatrics
  • Kevin O’Boyle, President, Legacy Good Samaritan Medical Center
  • Ann Marie Paulsen, M.D., The Portland Clinic
  • Natasha Pereira, M.D., The Children's Clinic
  • Kelley Pratt, M.D., Northwest Acute Care Specialists
  • Matthew Smith, M.D., Northwest Gastroenterology Clinic

Staff liaison, Jenny Robinson, executive director, email or 503-413-5894


Nathan Bay, M.D.

Silver Creek Family Medicine
Legacy Health Partners Board of Managers

Dr. Nathan Bay was born and raised in Silverton, Oregon. He attended Linfield College in McMinnville, Oregon. He obtained a biochemistry degree and a minor in theology. He attended St. Louis University School of Medicine. He graduated and attended the Oregon Health & Science University Cascade East Family Medicine Residency and had additional training in endoscopies. Dr. Bay has been practicing medicine in Silverton since 2010. He has established a broad practice as a Family Medicine Physician.


Resa Bradeen, M.D.

Metropolitan Pediatrics
Legacy Health Partners Board of Managers

Resa Bradeen, MD, is a pediatrician and health care leader working in the field for over 30 years. She is currently the Chief Medical Officer of Metropolitan Pediatrics LLC, a 50 provider private practice group in Portland, OR, and is also the Associate Medical Director of the Children’s Health Alliance & Foundation and supports the organization in strategy and contract development. Dr. Bradeen earned her medical degree from the University of Louisville School of Medicine and completed her residency in pediatrics at Oregon Health Sciences University in 1993. Resa brings a wealth of experience in quality improvement, health care payment strategies, population health, clinic operations, patient satisfaction, and provider engagement. She has wide-spread experience in pediatric leadership and patient care, particularly with Children with Special Health Care Needs, collaboration with various aspects of the health delivery system in all areas of health care transformation, and development and execution of large group risked-based health plan contracts.


Jennifer Byrne, D.O.

Columbia View Family Health
Legacy Health Partners Board of Managers
Legacy Health Partners Quality & Membership Committee Chair

Dr. Byrne received her bachelor’s degree from Yale University, New Haven, CT, and her medical degree from Oklahoma State University Center for Health Sciences in Tulsa, OK. She completed her internship at Eastmoreland Hospital, Portland, OR, in 2004 and her residency training at Swedish Medical Center, Seattle, WA, in 2006. Dr. Byrne is interested in preventive medicine, pediatrics and women’s health.


Robert Fu, D.O.

Pacific Medical Group
Legacy Health Partners Board of Managers

Dr. Fu was born in China, then immigrated to the Portland area when he was a child with his parents. He attended high school in the Beaverton area, undergraduate at the University of Oregon and medical school at Touro University Nevada. He completed his Internal Medicine residency training here back in Portland at Providence St. Vincent Medical Center. Dr. Fu chose to practice primary care because he enjoys lifelong interactions with his patients, guiding them through preventive health care as well as complex chronic disease management.



Anita Iyenger

Senior Vice President, Chief Strategy Officer, Legacy Health
Legacy Health Partners Board of Managers

Anita Iyenger is senior vice president, chief strategy officer at Legacy Health. She has been with Legacy for seven years in various strategic planning and leadership roles. She was most recently vice president of strategy and business development and was responsible for planning, business development, strategy deployment, and the Enterprise Project Management Office. She is an experienced and collaborative healthcare strategist with strong analytic and communication skills, deep industry knowledge, expertise in planning, governance, project execution, and a passion for designing innovative solutions that meet the needs of patients and care providers.



Steve Mansberger, M.D., MPH

Glaucoma Associates and Consultation
Legacy Health Partners Board of Managers

Dr. Mansberger is a board-certified ophthalmologist, who subspecializes in glaucoma and cataract surgery at Legacy Devers Eye Institute. Dr. Mansberger joined Devers in 1999, and now is Chief of Legacy Devers and Director of the Glaucoma Service. He has served on many Legacy committees. His research interests include glaucoma treatment and detection, ophthalmic epidemiology, and telemedicine. He has been honored with the Senior Achievement Award from the American Academy of Ophthalmology, Portland’s Top Doctors, and Best Doctors in America list since 2007. The National Eye Institute has continuously funded his research since 1999. He has published over 200 manuscripts. He has several patents and copyrights in glaucoma and diabetic retinopathy adherence. He is on the Editorial Boards of Journal of Glaucoma and American Journal of Ophthalmology.


Sharlene Mattheiu, M.D.

East Portland Pediatric Clinic
Legacy Health Partners Board of Managers

Dr. Matthieu attended medical school at Oregon Health & Science University, graduating in 2002. She then moved to Ohio to complete her pediatric residency at Cincinnati Children's Hospital Medical Center. In 2005 she returned to the Pacific Northwest and began practicing at East Portland Pediatrics. Dr. Matthieu enjoys working closely with patients and families, and has had the privilege of caring for multiple generations. She has special interests in clinical quality improvement, children with special healthcare needs, and adolescent mental health.



Erika Moseson, M.D.

Legacy Medical Group - Pulmonary Care
Legacy Health Partners Board of Managers

Dr. Mosesón is a pulmonologist and intensivist with Legacy Medical Group. She completed medical school at Cornell University, residency in internal medicine at the University of California San Francisco, and fellowship in pulmonary and critical care medicine at Oregon Health & Science University. She is the Medical Director for Respiratory Therapy and the Chair of Pulmonary Medicine at Legacy Emanuel Medical Center. Dr. Mosesón is the past President of Oregon Thoracic Society and currently serves on the Board of the American Lung Association in Oregon and the Environmental Health Policy Committee of the American Lung Association. She also hosts the Air Health Our Health podcast about the interaction between health and the air we breathe.


Melinda Muller, M.D., FACP

Senior Vice President, Chief Medical Officer, Legacy Health
Legacy Health Partners Board of Managers

Dr. Muller has served as a general internal medicine fellow, a chief resident in internal medicine and a resident and intern in internal medicine for Legacy Portland Hospitals. Dr. Muller is board certified by the American Board of Internal Medicine. She has served as Clinical Assistant Professor of Medicine at OHSU. She most recently served as Clinical Vice President, Care Transformation, and also was Clinical Vice President for Primary Care. A native Oregonian, Dr. Muller graduated with a medical degree from Oregon Health & Science University’s School of Medicine in 1996. Before that she received a bachelor’s of science (as a valedictorian) in medical technology from OHSU and a bachelor’s of arts in general studies math/science and pre-medical technology from Southern Oregon State College (now University) in Ashland. Her clinical interests include AIDS and HIV, gay and lesbian issues, preventive medicine and women's health. In the community, she volunteered for 10 years at the Outside In Transgender Clinic until it closed. She also has volunteered at other local clinics, as well as helping with the Oregon AIDS Hotline. Dr. Muller was named Healthcare Professional of the Year by the Oregon Association of Hospitals and Health Systems in 2010. In 2010, she also received the “Outstanding Young Physician Award” from the Oregon chapter of the American College of Physicians. She has also has been recognized by the National Committee for Quality Assurance (NCQA) and the American Diabetes Association (ADA) for providing quality care to her patients with diabetes. Dr. Muller has been practicing outpatient medicine at Legacy Good Samaritan’s Internal Medicine Clinic since 1996.

Richelle Neal, M.D.

Olson Pediatrics
Legacy Health Partners Board of Managers
Legacy Health Partners Finance & Contracting Committee Member

Dr. Neal is a board certified pediatrician who is a native Oregonian in private practice in Lake Oswego. Dr. Neal completed medical school at University of Washington School of Medicine and residency at Phoenix Children's Hospital. Upon completion of residency, Dr. Neal returned to the Pacific Northwest and has been practicing in the SW area of Portland since 2017. Dr. Neal believes there is no better job in the world than taking care of the younger Oregonian generation and has a hard time picking a favorite age group for she finds every age and stage rewarding.


Kevin O’Boyle

President, Legacy Good Samaritan Medical Center
Legacy Health Partners Board of Managers

Kevin O’Boyle is the president of Legacy Good Samaritan Medical Center. He joined Legacy in 2022 and brings to the Legacy system more than 20 years of diverse and profound hospital administration experience. His role at Legacy represents a pinnacle after senior level tenures at University of Chicago Medicine and Oregon Health & Science University, institutions known for their teaching and research connections. Kevin has spent his entire professional career working in health care, specifically hospitals. At Chicago, he was a special assistant to both the chief financial officer and chief operating officer before becoming the clinical administrator at its Comer Children’s Hospital and Department of Pediatrics. That roughly decade of experience led him to Portland and OHSU and posts there as a senior department administrator and the vice president of ambulatory care and access services. While at OHSU, Kevin was an incident command clinical support branch leader throughout the COVID-19 pandemic. He also served as operational leader for testing and vaccination efforts. At Legacy Good Samaritan, Kevin oversees the hospital’s vision, standards and operations. He received his bachelor of science degree from Nebraska Wesleyan University and a master of health services administration degree from University of Kansas.


Ann Marie Paulsen, M.D.

The Portland Clinic
Legacy Health Partners Board of Managers
Legacy Health Partners Quality & Membership Committee Vice-Chair

Dr. Paulsen completed her medical degree and residency at the University of Nebraska Medical Center in Omaha. She was drawn to internal medicine because she enjoys meeting people and helping them prevent and manage diseases. She believes in engaging her patients to take control of their health through active lifestyles and healthy eating. Dr. Paulsen has a special interest in women’s health, chronic disease management and geriatric medicine.



Natasha Pereira, M.D.

The Children's Clinic
Legacy Health Partners Board of Managers
Legacy Health Partners Finance & Contracting Committee Vice Chair

Dr. Pereira graduated from the University Of Pennsylvania School Of Medicine in 1999. She completed her residency at the Children’s Hospital of Philadelphia and then spent two years at CHOP in the Emergency Department providing urgent care. Following residency, she moved to Portland where she worked in Washington before joining The Children’s Clinic in July 2009. She is board certified in Pediatrics and is a Fellow of the American Academy of Pediatrics. Dr. Pereira feels it is a privilege to be so intimately involved in the lives of her pediatric patients and just loves watching her patients grow.


Kelley Pratt, M.D.
Northwest Acute Care Specialists

Photo and biography coming soon.


Greg Saunders

Greg Saunders, M.D.

Legacy Medical Group­ - Camas
Legacy Health Partners Board of Managers Chair

Dr. Saunders is board-certified in family medicine. Born and raised in Anchorage, Alaska, he completed his undergraduate degree and medical degree at the University of Washington in Seattle. He completed his residency in family medicine at the University of Wisconsin in Madison. Dr. Saunders practiced in Vancouver, Washington, for 10 years. In 2008, Dr. Saunders joined Legacy Medical Group–Fisher’s Landing as clinic site director and a primary care physician. In 2012, he became a regional primary care medical director for Legacy Health’s four primary care clinics associated with Legacy Salmon Creek Medical Center and served as co-director of Legacy Health’s emerging leadership program.


Matthew Smith, M.D.

Northwest Gastroenterology Clinic
Legacy Health Partners Board of Managers

Dr. Smith is a board-certified gastroenterologist in private practice at Northwest Gastroenterology Clinic since 2009 where he serves as Medical Director. He holds a BS in biology from the University of Oregon, a medical degree from Northwestern University School of Medicine, and completed his internship and residency at Virginia Mason Medical Center in Seattle, Washington. He received specialty training in gastroenterology at the University of New Mexico in Albuquerque. Dr. Smith has directed gastroenterology education for Legacy’s internal medicine residency program since 2010.



Damon Warhus, M.D.

Women's Healthcare Associates
Legacy Health Partners Board of Managers
Legacy Health Partners Finance & Contracting Committee Chair

Dr. Warhus attended the University of California, San Diego for medical school. He completed his residency training at Kaiser Medical Center in Santa Clara, California after which he moved to Portland and has been with Women’s Healthcare Associates, LLC ever since. He has served as President of WHA since 2010 and joined LHP on the Finance and Contracting Committee at its inception in 2015. Dr. Warhus chose OB/GYN for the variety and continuity it offered in being able to care for women throughout their lives. He enjoys helping each person understand their unique situation and options and appreciates being able to develop long-term relationships with patients and their families. His particular interests include minimally invasive surgery, including hysteroscopy and laparoscopic hysterectomy to treat or manage conditions such as abnormal bleeding, pelvic pain or endometriosis. He also has expertise in using ultrasound to diagnose and manage gynecological conditions and helps his colleagues do the same by serving as a designated gynecological ultrasound reader for WHA.