Plaza Ambulatory Surgery Center surgical specialists are experts in their respective fields. Click on the physician name to learn more about our team.

  • List of physician owners


    • Rehan Ahmad
    • Shaghayegh Alibadi-Wahle
    • David Antezana
    • Bryan Broadbent
    • Katherine Ching
    • Andrew Chiu
    • Christy Dunst
    • Jordana Gaumond
    • James Imatani
    • Richard Jamison
    • Gilbert Klemann

    • Lance Marr
    • David O’Brien
    • Andrew Pedersen
    • Kevin Reavis
    • Jacob Richard
    • Justin Rufener
    • Scott Soot
    • Mark Whiteford
    • Ann-Marie Yost
    • Karen Zink


  • Dr. Rehan Ahmad, MD, FRCS


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    Dr. Rehan Ahmad, MD, FRCS

    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 – Center for Advanced Surgery, including the John Hunter Medal in Biology and Colin C. MacPherson Bequest Prize in Orthopedic Surgery.


  • Dr. Shaghayegh Aliabadi-Wahle, MD, FACS


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    Dr. Shaghayegh Aliabadi-Wahle, MD, FACS

    Dr. Aliabadi-Wahle graduated from Tulane University School of Medicine in New Orleans, LA. She completed her residency at Henry Ford Hospital in Detroit, MI 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 – Center for Advanced Surgery. 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.


  • Dr. David Antezana, MD


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    Dr. David Antezana MD

    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 residency and fellowships at Johns Hopkins Hospital in neurological surgery, cerebrovascular research and orthopedic spine surgery. Dr. Antezana is Providence Health & Services’ lead investigator on two NIH-sponsored trials; and his research on neurophysiological monitoring in surgery has been presented at major international neurosurgical conferences. He currently serves as the chair of neurosurgery at Providence Portland Medical Center. Other Interests: Research • Spinal deformity surgery outcomes and complications • Neurophysiological monitoring in surgery • CLEAR-III Clinical Trial: determining whether rapid removal of intraventricular hemorrhage with a recombinant tissue plasminogen activator improves neurologic outcome • MISTIE-III Trial: determining whether minimally-invasive brain surgery plus recombinant tissue plasminogen activator in patients with intracranial hemorrhage results in improved functional outcome Recent Abstracts • EMG Monitoring Threshold in Lumbar Spine Pedicle Screw Testing. Scoliosis Research Society Annual Meeting, Lyon, France, September 2013. • Evaluation of EMG Monitoring of Pedicle Screw Placement With CT Scan Confirmation in an Adult Deformity Population. American Association of Neurological Surgeons Annual Scientific Meeting, San Francisco, April 2014. Volunteer Educator • Dangerous Decibels, a hearing-preservation program for grade schools, developed by OHSU scientists and funded by the National Institutes of Health.


  • Dr. Christy M. Dunst, MD, FACS


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    Dr. Christy M. Dunst, MD, FACS

    Dr. Dunst attended undergraduate and medical school at the University of Colorado Health Sciences Center receiving B.A. in Molecular and Cellular Development Biology, Psychology and M.D. Dr. Dunst completed her General Surgery Internship, Residency and Fellowship in critical care at Hennepin County Medical Center in Minneapolis Minnesota. Dr. Dunst then completed her fellowships in Thoracic Foregut/Esophageal Surgery at the University of Southern California. In addition to her partnership at Plaza Ambulatory Surgery Center Dr. Dunst is also a member of the Society of American Gastrointestinal Endoscopic Surgeons, The Society of Surgery of the Alimentary Tract, The American College of Surgeons, The American Society of Gastrointestinal Endoscopy, and The International Society for Disease of the Esophagus and the Portland Surgical Society.


  • Dr. Gustav Fischer, MD


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    Dr. Gustav Fischer MD

    Dr. Fischer is a board-eligible Hip and Knee Reconstruction fellowship-trained orthopaedic surgeon. His professional interests include hip and knee replacement, hip and knee revision, fracture repair, arthroscopic surgery, and general orthopaedic surgery. Education and Training: – B.Sc. Biology, Oregon State University – M.D. University of Nevada School of Medicine – Residency training in orthopedic surgery – University of Kansas School of Medicine, Wichita – Adult Reconstruction Fellowship – Cleveland Clinic Affiliations: – Candidate Member – American Academy of Orthopedic Surgeons – Candidate Member – American Association of Hip and Knee Surgeons – Member – Oregon Association of Orthopedic Surgeons – Member – Oregon Medical Association


  • Dr. Jordanna Gaumond, MD


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    Dr. Jordanna Gaumond MD

    Dr. Gaumond completed her Medical Degree and General Surgery residency at Oregon Health & Science University. She then completed a fellowship in Transplantation Surgery at The Ohio State University. She is a Fellow of the American College of Surgeons. She is board certified by the American Board of Surgery and certified by the American Society of Transplant Surgeons. She enjoys all aspects of treating patients with surgical needs and in caring for each patient as an individual. Her practice interests include all areas of General Surgery, open and laparoscopic for Cancer and non-Cancer disease processes. Examples of common procedures include, but are not limited to, surgery for diseases of the breast, gallbladder, intestine or colon, kidney, abdominal wall or musculature (hernia), autoimmune disorders, tumors, masses, and cancers. Other Interests: When she is not practicing surgery, she enjoys outdoor and family activities.


  • Dr. Richard Jamison, MD, FACS


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    Dr. Richard Jamison, MD, FACS

    Dr. Jamison attended Stanford University for his undergraduate studies before pursuing his doctorate in medicine at the Mayo Medical School in Rochester, MN. His residency was completed at the Mayo Graduate School of Medicine. Dr. Jamison specializes in thyroid and parathyroid surgery, gallbladder surgery, and hernia surgery. Dr. Jamison serves on the Board of Directors at Plaza Ambulatory Surgery Center as the secretary. His other accomplishments include: Executive VP, The Oregon Clinic Clinical Professor, Oregon Health & Sciences University Fellow, American College of Surgeons Member, Western Surgical Alliance Priestley Society, Association of Mayo Clinic Surgeons Member, American Association of Endocrine Surgeons


  • Dr. Gilbert Klemann, MD


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    Dr. Gilbert Klemann MD

    Dr. Klemann graduated from Emory University School of Medicine in Atlanta, GA. He later completed his internship in general surgery and his residency in urology at the State University of New York at Buffalo, NY. He focuses on bladder cancer, kidney cancer and general urology at The Oregon Clinic – Urology. Dr. Klemann brings several honors and awards to the clinic, and has been inducted into the National Honor Society and Phi Theta Kappa at the University of North Carolina in Chapelhill, NC. Dr. Klemann is a member of the American Urological Association and the Endourological Society.


  • Dr. Lance Marr, MD


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    Dr. Lance Marr MD

    Dr. Marr graduated from Oregon Health & Science University (OHSU) and later completed a general surgery residency, urology, and renal transplant residency at OHSU. He finished a research fellowship at Northwestern University in Chicago, IL. Dr. Marr focuses on bladder cancer, kidney cancer, and general urology at The Oregon Clinic – Urology. He is also a volunteer for the International Volunteers of Urology, the Wallace Medical Concern, the Safehaven Community Outreach program and is an organizer for Physicians for Social Responsibility at OHSU. Other Interests: Dr. Marr’s personal interests include traveling, basketball, distance running, flying, hiking, and golfing.


  • Dr. David O’Brien, MD, FACS, FASCRS


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    Dr. David O’Brien, MD, FACS, FASCRS

    Dr. O’Brien graduated from Emory University School of Medicine in Atlanta, GA. Dr. O’Brien completed his internship and residency at the University of Cincinnati, Department of Surgery. He was the Chief Resident at the University of Cincinnati, Department of Surgery in 2003-4. Dr. O’Brien completed a clinical fellowship in colorectal surgery at the Cleveland Clinic Foundation in Cleveland, OH. In addition to his partnership at Plaza Ambulatory Surgery Center Dr. O’Brien is a fellow of the American Society of Colon and Rectal Surgeons, and a Fellow of the American College of Surgeons. Dr. O’Brien is a member of The Society of American Gastrointestinal and Endoscopic Surgeons, The Northwest Society of Colon and Rectal Surgeons, The Oregon Medical Association and a Socioeconomic Member of the American Society of Colon and Rectal Surgeons.


  • Dr. Andrew Pedersen, MD, Ear Nose & Throat


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    Dr. Andrew Pedersen, MD, Ear Nose & Throat

    Dr. Pedersen received his MD from Oregon Health & Science University (OHSU). He later completed his surgical internship and finished his residency in Otolaryngology – Head and Neck Surgery at the University of Florida in Gainesville, FL. He now focuses on general head, neck and sinus related issues and Thyroid & Parathyroid Surgery at The Oregon Clinic Ear, Nose & Throat – Plaza. Dr. Pedersen has been featured as one of Portland Monthly Magazine’s Top Doctors, and is a member of many associations and organizations, including the American Medical Association and the American Rhinologic Society.


  • Dr. Kevin Reavis, MD, FACS


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    Dr. Kevin Reavis, MD, FACS

    Dr. Reavis graduated from Vanderbilt University School of Medicine in Nashville, TN. He later completed an internship and residency at Oregon Health & Science University (OHSU). Dr. Reavis completed a fellowship in general surgery at The Ohio State University Medical Center in Columbus, OH. He brings many honors and awards to The Oregon Clinic – Center for Advanced Surgery, including the Award for Excellence in Patient Directed Care from The VA Medical Center of Long Beach.


  • Dr. Jacob Richard, MD


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    Dr. Jacob Richard MD

    Dr. Richard graduated from the University of Pittsburgh School of Medicine. He later completed his internship and residency at the Wake Forest University Baptist Medical Center in Winston-Salem, NC. Dr. Richard is a member of the American Urological Association and the Endourological Association. His areas of focus include Robotic Surgery and Urinary Stones.


  • Dr. Justin Rufener, MD, Ear Nose & Throat


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    Dr. Justin Rufener, MD, Ear Nose & Throat

    Dr. Rufener graduated from Oregon Health & Science University (OHSU) and later completed his internship and residency at Henry Ford Health System in Detroit, MI. Dr. Rufener currently focuses on Endoscopic Sinus Surgery, Laryngology and Thyroid & Parathyroid surgery at The Oregon Clinic Ear, Nose & Throat – Plaza. Dr. Rufener has been awarded the Richard D. Nichols Research Award and has been inducted into the Alpha Omega Alpha Honor Medical Society. He is also a member of The American Academy of Otolaryngology, The American Academy of Facial Plastic and Reconstructive Surgery, and the American Medical Association.


  • Dr. Scott Soot, MD


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    Dr. Scott Soot MD

    Dr. Soot is an Oregon native, and started his surgical practice in 2000. He completed his medical school and residency at Oregon Health & Sciences University in Portland, and went on to start practice in Portland. He is Board Certified in General Surgery, and is a fellow of the American College of Surgeons. He is married, and has 2 children. He enjoys all aspects of General Surgery in his practice. He has a particular interest in melanoma, laparoscopic surgery, and hernia repair. He also has a focus on colon and small bowel disease, gallbladder disease, breast cancer, melanoma, and soft tissue masses. Other Interests: When he is not practicing surgery, he enjoys a wide variety of outdoor activites, including boating, fishing and alpine skiing.


  • Dr. Mark Whiteford, MD, FACS, FASCRS


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    Dr. Mark Whiteford, MD, FACS, FASCRS

    Dr. Whiteford graduated from the University of Maryland School of Medicine and later completed his general surgery internship and residency at Thomas Jefferson University Hospital in Philadelphia, PA. Dr. Whiteford finished his fellowship in colon and rectal surgery at the Barnes-Jewish Hospital in St. Louis, MO. He brings The Oregon Clinic –Center for Advanced Surgery several honors and awards, and was the 2007 recipient of the Society of the Alimentary Tract Traveling Fellowship in Surgical Endoscopy. He was also inducted in the Marquis Who’s Who in America publication in 2010. Dr. Whiteford is the Clinical Assistant Professor at Oregon Health & Science University (OHSU) and is a member of many organizations, including the American College of Surgeons, and the Northwest Society of Colon and Rectal Surgeons.


  • Dr. Ann-Marie Yost, MD


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    Dr. Ann-Marie Yost MD

    Dr. Yost graduated from the University of Pennsylvania in Philadelphia, PA and received her MD from George Washington University in Washington, D.C. She later completed an internship in general surgery and a residency in neurological surgery at George Washington University Hospital in Washington D.C. Dr. Yost is a Fellow of the American Association of Neurological Surgeons and a practicing neurosurgeon at The Oregon Clinic. Other Interests: Kayaking, Reading, Scuba Diving


  • Dr. Karen Zink, MD


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    Dr. Karen Zink MD

    Dr. Zink completed her General Surgery Residency training at Oregon Health & Sciences University in 2010. She is board certified by the American Board of Surgery and is a Fellow of the American College of Surgeons. She earned her medical degree at Washington University School of Medicine in St. Louis. She completed her undergraduate degree at the University of Illinois at Urbana-Champaign. Dr. Zink is the Co-Surgeon Champion for the National Surgical Quality Improving Program for Providence Medical Center. She, along with Dr. Yu, leads and oversees program implementation and quality initiatives aimed to improve surgical outcomes. She is a general surgeon who is interested in the broad range of general surgery, with a focus on minimally invasive surgery. Areas of interest include gallbladder surgery, hernias (laparoscopic and open), colon and small bowel surgery, surgery for melanoma, and surgery for breast disease. She is particularly interested in working with athletes and others who participate in strong physical activity, on helping them return to a high level of function as quickly as possible after hernia repairs and other surgeries. She has experience working with long distance runners, advanced cyclists, people who do heavy lifting for work, and others interested in maintaining their physical activity. Other Interests: When not working, she enjoys juggling, unicycling, trapeze, skiing, kayaking, cooking, traveling, camping and playing with her family.