Our Staff

All professionals at Legacy Center for Maternal Fetal Medicine maintain the highest levels of accreditation and pursue ongoing education to stay abreast of the latest trends in the medical field. All of our providers and staff have one goal in mind and that is to provide the best care for all patients and their unborn baby in the most supportive environment possible.  From your first encounter with our front office staff, to our nursing staff, genetic counselors, our sonographers and all of our providers, we want you to feel welcome, supported, and have all the information you need to be able to actively participate in your care.  We want to provide you all the tools necessary to ask questions and assist in making the best decisions for the management of your pregnancy.   Read on to learn more about our staff's experience and training.  

Karen L. Archabald, MD

Karen Archabald, MD received her medical degree and MFM Fellowship from Yale University School of Medicine and completed her OB-GYN residency at Women and Infants Hospital of Rhode Island/Brown University. Dr. Archabald is a Fellow of the American College of Obstetrics and Gynecology and by virtue of her recent fellowship graduation is Board Eligible in Maternal-Fetal Medicine. Before her medical training, Dr. Archabald served in the Peace Corps in Uganda and has returned to Africa to assist in training African obstetricians. She is committed to providing care to the underserved and enjoys working with the ethnic and socioeconomic diversity of patients at Legacy. Her goal is to guide women through their complicated pregnancies with grace and understanding. When not working, she enjoys spending time with her family, camping, hiking, and doing yoga.


Anya J. Bailis, MD

Dr. Bailis was born and raised in Cleveland, Ohio. After receiving her BA in Biology from Vassar College in 1995, she joined the Peace Corps where she served as a Community Health Educator in Gounou-Gaya, Chad. It was at a Medicine Sans Frontier hospital in this central African village the she had her first exposure to OB care working with the village midwives to improve the quality of prenatal visits. This experience solidified a passion for caring for pregnant women.

Upon returning to the states as she earned her medical degree from Drexel University College of Medicine in Philadelphia in 2003 and then moved to Baltimore where she completed her OB-GYN residency and Maternal-Fetal Medicine fellowship at Johns Hopkins School of Medicine. During her fellowship, Dr. Bailis ran a clinic for HIV-positive pregnant women and developed an interest in ultrasound, and prenatal diagnosis.

Dr. Bailis is board-certified in Maternal-Fetal Medicine, a fellow of the American College of OB-GYN and a member of the Society for Maternal-Fetal Medicine and she is currently the Medical Director of Legacy Maternal-Fetal Medicine. She relishes guiding and supporting women through the most scary and amazing journey of their lives and developing robust physician-patient relationships. She is committed to providing her patients with the highest quality care as a pathway the best possible pregnancy  outcomes.

Dr. Bailis moved to Portland and Legacy Health following completion of her fellowship in 2010. She and her husband, Bernd, had visited during residency and fell in love with this beautiful and friendly city. When she is not attending swim meets, soccer games or birthday parties, Dr. Bailis spends her free time exploring the Pacific Northwest with her husband and three crazy children.


John G. Buckmaster, MD

Specialty: Maternal Fetal Medicine

Sub Specialties: Genetics, Board-certified; Obstetrics & Gynecology, Board-certified

Clinical Interests: High Risk Obstetrics, Maternal Fetal Medicine

Languages: English, Interpreters available for other languages

Gender: Male


Fred H. Coleman, MD

Basics: College at Pomona College in southern California followed by medical school at Northwestern in Chicago. Spent a while in the Army, with training in obstetrics and gynecology and then maternal fetal medicine. Moved around some while I was in practice, with much of my time in Oklahoma City, before coming to Legacy in 2004. Stayed with Legacy, where I still am, mostly at Salmon Creek WA, though I am occasionally at Emanuel as well.

Less basic: Old. Really old. I remember before the internet, though we did have cars to get around, unlike what one of my kids thought. Because I’m so old, I’ve seen a lot and done a lot, so I tend to be quite flexible in how to manage your pregnancy, should you happen to have preconceived (note the pregnancy humor) notions about how your pregnancy should proceed. I have delivered in a pasture and an ICU and everything in-between. I think that OB is the best job and I love helping patients through their pregnancy. At the same time, I am happy to stand on the sidelines and cheer you on; I don’t think I would have enough nerve to go through a pregnancy, even if I could (besides, I’ve produced my share – someone else can have the children).

Philosophy: I think pregnancy is a choice and you should be supported in most requests. At the same time, if I think there are reasons to consider alternatives, I will let you know and explain why. I have a very dry (sarcastic) sense of humor which most like (eventually) but it’s not for everyone. 


Amy D. Bednar, MD, FACOG

Amy D Bednar, MD, MCR received her medical degree from the University of Texas Medical Branch and completed her OB-GYN residency at the University of Alabama Birmingham. She completed her Maternal-Fetal Medicine fellowship and Masters of Clinical Research at Oregon Health & Science University. Dr. Bednar is a board-certified OB/GYN, Fellow of the American Congress of Obstetrics and Gynecology, and by virtue of her recent fellowship graduation is board-eligible in Maternal-Fetal Medicine. She has published several articles in peer-reviewed journals regarding multiple gestations and timing of delivery. Her research interests include amniotic fluid volume regulation, multiple gestations, and diagnostic ultrasound. At the Legacy Center for Maternal-Fetal Medicine she enjoys the variety of managing all aspects of pregnancy from prenatal diagnosis to labor and delivery. Dr. Bednar spends her free time outdoors hiking/camping, skiing, and traveling with her husband and new son.


Patrick Andy Merrill, MD

Andy Merrill MD completed his medical degree at Baylor College of Medicine in Houston, Texas, Dr. Merrill completed his OB-GYN residency in Cincinnati, Ohio, and his fellowship in maternal-fetal medicine at the University of California, Irvine. In 1986, Dr. Merrill came to Legacy Emmanuel Hospital and has been serving the Portland high risk pregnancy community for over 30 years.

Dr. Merrill’s clinical interests include assessment of fetal well-being and prevention of stillbirth. In addition to clinical responsibilities, his dedication to women’s health is demonstrated by his continual involvement in resident and medical student education. Dr. Merrill is also concerned about community issues outside of maternal fetal medicine. He is a founding board member of the Oregon chapter of the American Foundation for Suicide Prevention.

When not providing his patient centered approach to maternal fetal care, he enjoys spending time with his family, gardening and skiing. 


John Mission, MD

Dr. Mission earned a medical degree from University of California San Francisco. He completed residency in Obstetrics and Gynecology at OHSU. He later completed a fellowship in Maternal-Fetal Medicine at Magee-Womens Hospital of UPMC in Pittsburgh, PA.

Dr. Mission respects his patient’s individual needs and is highly regarded by his patients. He models healthy living and outside of work enjoys crossfit and yoga. He also enjoys cooking and baking.


Karen Rieman, NP


Karen is a Nurse Practitioner at Maternal Fetal Medicine, Board Certified in Women's Health Care since 1996.  Her special interests include assisting and welcoming patients at their first visit, care coordination and postpartum care. She works with our patients to address current pregnancy risks and concerns, while also celebrating the pregnancy as we navigate this journey together. 

After delivery she works with patients on recovery from the delivery, contraception options and seamless return to care with the primary care provider should there be any chronic medical issues or long-term follow up needs.  Part of postpartum care is discussing how our patients are feeling emotionally. If baby blues or signs of post-partum depression emerge, she will support the patient and her family and assist with referrals if needed.

Karen grew up in the Midwest with role models who were strong advocates for women's rights which laid the foundation for her interest in women's health.  She believes that we are here to serve our patients while respecting that this is THEIR experience, and that as health care providers our job is to listen, provide expert opinion and care, and support our patients in ways that optimize the pregnancy experience. We all have the same goal: a positive outcome no matter what the circumstances.

She feels lucky to be supported in her career path by her husband and twin son and daughter. Even though the kids are now away at college, she remembers experiencing her own a high risk pregnancy with them and adjusting to parenthood with premature babies.  She is excited to be entering this new "empty nest" phase and hopes to brush up on yoga, explore the beauty of the Pacific Northwest, and travel internationally to learn more about other cultures.



Patricia Robertson, MD

Dr. Robertson received her medical training at Tulane University and completed a residency in obstetrics and gynecology at the University of Pennsylvania. At Oregon Health Science University, Dr. Robertson completed a fellowship in maternal-fetal medicine.  She is a diplomat of the American College of Obstetrics and Gynecology and is board certified in obstetrics and gynecology as well as maternal-fetal medicine

In caring for women in high risk pregnancies, Dr. Robertson’s passion is to provide compassionate and evidenced based care to all her patients. She particularly enjoys ultrasonography, prenatal diagnosis, and the care of mothers who have pregnancies with complex clinical situations. She is proficient in Spanish, having spent time in Buenos Aires, Argentina as a volunteer during her medical school training.  Her dedication to research has led her to publish numerous articles in peer reviewed journals and particular interest in amniotic fluid regulation and ultrasonography. A major goal in her patient care is for each patient to understand fully any condition they face, and for her consultation to provide comfort and compassion to patient and family.

In her spare time, Dr. Robertson enjoys hiking, cycling, weight lifting and spending time with her family. She is an enthusiastic Portland Thorns fan as well as of any team her daughters have joined.


Sonja K. Erlandson, RN

Her passion for the care of high risk pregnant women started in 1988 as a Registered Nurse working with high risk patients in Labor and Delivery at Kapiolani Women's and Children's Hospital in Honolulu, Hawaii. She then spent 24 years working in labor and delivery, taking care of a broad spectrum of patients at St.Vincent Hospital and Medical Center in Portland. This experience was invaluable for her new role. Many of these women carried babies whom would need extra care in the Neonatal Intensive Care Unit after delivery. In 2013, Sonja joined Legacy as the Fetal Care Coordinator for Legacy Emanuel's Fetal Therapy Program. She cares for high risk pregnant women and their families through care coordination. Sonja specializes in referring our Fetal Therapy Patients to our many pediatric subspecialists before delivery and helps provide a smooth transition for babies who will need extra care after delivery in our Neonatal Intensive Care Unit here at Randall Children's Hospital.