The Oregon Clinic

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	Vesna Ader, PA-C	Gastroenterology
	Ms. Ader graduated from the University of Florida with a degree in Microbiology. She later completed a Master's of Health Sciences degree in Physician Assistant Studies from the University of South Alabama. Ms. Ader brings many honors and awards to The Oregon Clinic, West Hills Gastroenterology division including being inducted into the Alpha Theta Chi Collegiate Honor Society and the Phi Theta Kappa Honor Society. She is also a member of the Portland-Vancouver PA Society and the American Academy of Physician Assistants. Learn More

	Rehan Ahmad, MD, FRCS	Colon & Rectal Surgery
	Dr. Ahmad completed his undergraduate education at the University of Glasgow Medical School in Scotland. He completed his general surgery residency at the University of Illinois, Metro Group Hospitals in Chicago and later completed a fellowship in colon and rectal surgery. Dr. Ahmad brings several honors and awards to The Oregon Clinic, Gastrointestinal and Minimally Invasive Surgery division including the John Hunter Medal in Biology and Colin C. MacPherson Bequest Prize in Orthopedic Surgery. During his spare time, Dr. Ahmad enjoys music, medieval history and literature. He also maintains interest in skiing, rugby and cricket. Learn More

	Jeffrey Albaugh, MD	Gastroenterology
	Dr. Albaugh graduated from the University of Washington and later completed his internal medicine internship and residency at the Madigan Army Medical Center in Tacoma. He finished his fellowship in gastroenterology at Oregon Health and Science University (OHSU) in Portland. Dr. Albaugh’s primary areas of focus include esophageal manometry and motility-esophageal manometry at The Oregon Clinic, Portland Gastroenterology division. He is also board certified in Internal Medicine and Gastroenterology. Dr. Albaugh is a member of several organizations including the American Gastroenterological Association, the Medical Society of Metropolitan Portland and the Oregon Medical Association. Learn More

	Shaghayegh Aliabadi-Wahle, MD, FACS	General Surgery
	Dr. Aliabadi-Wahle graduated from Tulane University School of Medicine in New Orleans. She completed her residency at Henry Ford Hospital in Detroit and finished her research fellowship at Tulane University School of Medicine. Dr. Aliabadi-Wahle focuses on minimally invasive parathyroid surgery, gallbladder surgery and minimally invasive surgical needs at The Oregon Clinic, Gastrointestinal and Minimally Invasive Surgery (GMIS) division. She is a member of several organizations including The Endocrine Society and the American College of Surgeons. She is also the Director of General Surgery and the former Chief of Surgery at Providence Portland Medical Center. Learn More

	David Antezana, MD	Neuro Surgery
	Dr. Antezana has been a neurosurgical consultant in Portland since 2002. He earned a Bachelor of Science in biomedical engineering from Catholic University of America, and an M.D. from the University of Minnesota. He later completed internships and fellowships at Johns Hopkins Hospital in general surgery, neurological surgery, cerebrovascular research and orthopedic spine surgery. Dr. Antezana is Providence Health & Services’ lead investigator in an NIH-sponsored trial on intracranial intraventricular hemorrhage. Learn More

	Stephen Bader, MD	Oncology: Radiation
	Dr. Bader graduated from the University of Washington. He completed his internship and residency in internal medicine at the New England Deaconess Hospital, Harvard Medical School. He later finished his fellowship and became Chief Resident for the Joint Center for Radiation Therapy at Harvard Medical School. Currently, Dr. Bader is a member of several organizations including the American Society for Clinical Oncology, the American Society for Therapeutic Radiation Oncology and the American Brachytherapy Society. Dr. Bader is also the former Medical Director of the Department of Radiation Oncology at Providence Health System and the Gamma Knife Center of Oregon. Dr. Bader focuses on breast cancer, lung cancer, head and neck malignancies and other radiation oncology needs at The Oregon Clinic, Radiation Oncology division. Learn More

	Martin Baggenstos, MD	Neuro Surgery
	Dr. Baggenstos received his bachelor’s degree from the University of Notre Dame and subsequently his Doctorate of Medicine from Tufts University School of Medicine in Boston, MA. Dr. Baggenstos then completed his general surgery internship and neurosurgical training at George Washington University in Washington, D.C. He also received fellowship training in neurosurgical oncology at the National Institutes of Health.Among his many publications, Dr. Baggenstos has also received multiple clinical honors, including the Integra Foundation Award and Synthes Skull Base Surgery Award for his research in neuro-oncology. He specializes in the treatment of cranial, skull base and spine disorders, with an emphasis on minimally invasive surgical techniques. His professional affiliations include memberships in the American Association of Neurological Surgeons and Congress of Neurological Surgery. Learn More

	Samuel Bartholomew, MD, FACS	Plastic Surgery
	Dr. Bartholomew received his medical doctorate from the University of California, San Francisco School of Medicine. He completed residencies in surgery at Oregon Health & Science University (OHSU) and plastic surgery at UC Davis Medical Center. Dr. Bartholomew was a Research Associate at the Pasteur Institute in Paris, France and the Division of Plastic and Reconstructive Surgery at OHSU where he performed research on adult derived stem cells for tissue engineering. He has presented his research at national and international meetings. He is a member of the American Society of Plastic Surgeons. Learn More

	Deborah Beers, Esthetician	Medical Spa
	Deborah graduated from the International School of Skincare in the Esthetics Program. Deborah is a member of the Associated Skin Care Professionals and a volunteer for the American Cancer Society, Look Good Feel Better Program. Deborah treats her clients at The Oregon Clinic, ENT East division. Learn More

	Kent Benner, MD	Gastroenterology
	Dr. Benner graduated from UCLA and later completed his internal medicine internship and residency at the University of Colorado in Denver. He also completed two fellowships in Gastroenterology including one at Washington University in St. Louis and the other at Oregon Health and Science University (OHSU). Dr. Benner focuses on hepatology and other gastroenterology needs at The Oregon Clinic, Portland Gastroenterology division. Not only is Dr. Benner board certified in internal medicine and gastroenterology, but is a member of several associations and organizations including the Oregon Medical Association, the American Federation for Clinical Research and the International Liver Transplantation Society. He is also the Chair of the National Institutes of Health and has been the reviewer for several medical journals including the American Journal of Gastroenterology and the Journal of Clinical Gastroenterology. Learn More

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Subspecialty

Our Newest Providers

Emily Forsyth, MPAS, PA-C

Sheri Smith, MS, CCC-A

David Reavis, PA-C

Banny Wong, MD

Megan Wrightman, PA-C, MHS

Ann-Marie Yost, MD

Frederick Vincent, MD, FRCSC

Michael Sandquist, MD

Oisin O'Neill, MD, FRCSI, FACS

Pankaj Gore, MD

Featured Provider

Catherine Ellison, MD
Neurology Division

Dr. Ellison graduated from Oregon Health and Sciences University (OHSU) in Portland. She completed her internship at Good Samaritan Hospital. She later completed her residency in Neurology at OHSU.Dr. Ellison is a member of the American Medical Association and the Oregon Medical Association. She is board certified in Neurology by the American Board of Psychiatry and Neurology.

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