Maurice W. Nicholson, M.D., F.I.C.A.
Certified by the Medical Board of Forensic Medicine and licensed in Hawaii and California, Dr. Maurice Nicholson serves as Medical Director at Gamma Knife Center of the Pacific. After earning his medical degree from the University of Alberta School of Medicine, he completed his Neurological Surgery Residency at Henry Ford Hospital in Detroit, MI. In addition to being a member of several professional organizations—including the Hawaii State Medical Society, American Medical Association and Hawaii Neurological Association—Dr. Nicholson is a member of the Editorial Board of the International Journal of Angiology.
Jon F. Graham, M.D., F.A.C.S.
After earning a medical degree from Wayne State University of Medicine in Detroit, MI, Dr. Jon F. Graham completed a Flexible Internship and a Neurosurgery Residency at the Walter Reed Army Medical Center in Washington, D.C. He completed his Fellowship as a Research Associate in Neuro-oncology at the National Institute of Neurological, Communicative Disorders and Stroke in Bethesda, MD.
Dr. Graham is Board Certified by the National Board of Medical Examiners and the American Board of Neurological Surgery and a member of the American Association of Neurological Surgeons, Congress of Neurological Surgeons, and Hawaii Association of Neurological Surgeons. His clinical interests include minimally invasive spine and cranial surgery, cerebrovascular surgery, and skull base surgery.
Leon Liem, M.D., F.A.C.S.
Assistant Medical Director
Dr. Leon K. Liem earned his medical degree from Albert Einstein College of Medicine in Bronx, NY. He completed his internship in general surgery at the University of Maryland Medical Systems, his rotation in the Neurosurgery Department at the Barrow Neurological Institute in Phoenix, AZ, and his residency training in neurosurgery also at University of Maryland. Board Certified by the National Board of Medical Examiners and the American Board of Neurological Surgery, Dr. Liem’s clinical interests include complex spine surgery, Gamma Knife radiosurgery, endoscopic spine and cranial surgery, cerebrovascular surgery and pain neurosurgery.
Michon Morita, M.D.
After earning his medical degree from Washington University School of Medicine, St. Louis, MO, Dr. Michon Morita completed residency training in Neurological Surgery at the University of California–San Francisco School of Medicine, followed by a post-doctoral fellowship in Pediatric Neurosurgery, also at UCSF School of Medicine.
Eric M. Oshiro, M.D.
Dr. Eric M. Oshiro received his medical degree from Stanford University, and completed his General Surgery Internship and Neurosurgery Residency at John Hopkins Hospital. He then completed a Clinical Fellowship at the Surgical Neurology Branch of the National Institute of Health and Cerebrovascular Research, also at Johns Hopkins. He is currently in private practice in Honolulu, HI.
Daniel Donovan, M.D.
Dr. Daniel Donovan earned an undergraduate degree from Duke University, followed by a medical degree from Washington University in St. Louis, MO, on scholarship from the U.S. Army. He completed his surgical internship and residency training in Neurosurgery at Walter Reed Army Medical Center in Washington, DC. Dr. Donovan was stationed at an Army hospital in Texas before being transferred to Tripler Army Medical Center in Honolulu, where he served as Chief of Neurosurgery from 2000 to 2005. Board Certified in Neurological Surgery, Dr. Donovan is Medical Director of Neurotrauma at the Queen’s Medical Center, a Clinical Assistant Professor of Surgery at the University of Hawaii–John A. Burns School of Medicine, and has been performing Gamma Knife stereotactic radiosurgery in Hawaii since 2000.
Mark Gerber, M.D.
Dr. Mark Gerber received his medical degree from the University of Florida College of Medicine in Gainesville, FL, and completed residency training in Neurological Surgery and a fellowship in complex spinal surgery at the Barrow Neurological Institute in Phoenix, AZ. He is Board Certified by the National Board of Medical Examiners and the American Board of Neurological Surgery. Dr. Gerber is a member of the Hawaiʻi Pacific Health Medical Group.
Matthew Y. Chang, M.D.
Dr. Matthew Y. Chang is a neurosurgeon with the Hawaii Permanente Medical Group, practicing at Kaiser Permanente’s Moanalua Medical Center. He earned his medical degree from Case Western Reserve University School of Medicine in Cleveland, OH, and completed his neurosurgery residency at the University of Colorado School of Medicine. Dr. Chang is Board Certified in Neurological Surgery, and a member of the American Medical Association and the American Academy of Neurological Surgeons. His professional interests include brain tumors, Gamma Knife radiosurgery, deep brain stimulation for Parkinson’s Disease and spinal surgery.
Thomas Noh, M.D.
Dr. Thomas Noh was born and raised in Honolulu, Hawaiʻi. He attended the University of Washington and graduated from the undergraduate honors program in biology and psychology. He was selected to work in Dr. Richard Winn’s neuroscience research lab, which inspired him to become a doctor. While attending the University of Hawaiʻi John A. Burns School of Medicine (JABSOM), he was awarded a prestigious neurosurgical research fellowship at Duke University. Dr. Noh then completed his neurosurgical residency at Henry Ford Hospital and additionally pursued a fellowship in tumor and image-guided surgery at Harvard’s Brigham and Women’s Hospital.
Dr. Noh’s professional interests include complex spine disorders, brain tumors, image-guided surgery, and laser interstitial thermal therapy. Dr. Noh is a member of the Hawaiʻi Pacific Health Medical Group.
Susie A. Chen, M.D.
Director of Radiation Oncology
Originally from Florida, Dr. Susie A. Chen obtained her undergraduate and medical degree at the University of Miami. She completed an internal medicine internship and radiation oncology residency at Emory University in Atlanta, GA. Afterwards, she served as a faculty member at University of Texas Southwestern in Dallas, specializing in head and neck tumors. As a Board Certified radiation oncologist, Dr. Chen focuses on integrating technologies to create personalized plans in short courses of treatments. Dr. Susie Chen is a Radiation Oncologist with Cancer Center of Hawaiʻi.
Laeton J. Pang, M.D., M.P.H.
Dr. Laeton J. Pang earned a medical degree from Tulane University School of Medicine in New Orleans, LA, and completed his M.P.H. degree at Tulane University School of Public Health. He completed his internship in General Surgery at the University of Texas Medical Branch Hospital in Galveston, followed by residency training in Radiation Oncology at the University of Virginia Health Sciences Center in Charlottesville.
Dr. Pang is Board Certified in Radiation Oncology by the American Board of Radiology and the Federation of State Medical Boards. Dr. Laeton Pang is a Radiation Oncologist with Cancer Center of Hawaiʻi.
Thanh Van Huynh, M.D.
Certified by the American Board of Radiology in Radiation Oncology, Dr. Thanh Van Huynh currently serves as Assistant Professor in the Department of Surgery at the University of Hawaii–John A. Burns School of Medicine.
After receiving his medical degree at Saigon University, Saigon, Vietnam, Dr. Huynh served as Fellow in the Department of Radiation Therapy at Memorial Sloan-Kettering Cancer Center in New York, NY, and completed his residency in Therapeutic Radiology in the Department of Radiation Therapy and Nuclear Medicine at the Hahnemann Medical College and Hospital in Philadelphia, PA.
Pi-Ju Christina Liu, M.D.
Dr. Pi-Ju Christina Liu received her medical degree from Baylor College in Houston, TX, and completed her residency at the Johns Hopkins Hospital in Baltimore, MD. Dr. Liu is Board Certified in Radiation Oncology by the American Board of Radiology.
Stuart Tsuji, M.D.
Dr. Stuart Tsuji is a Radiation Oncologist with The Queen’s Medical Center’s Radiation Oncology Department. He also serves as an Assistant Clinical Professor for the University of Hawaii–John A. Burns School of Medicine and University of Hawaii Cancer Center. His special interests include prostrate, central nervous system, breast, lung, hematologic/lymphoma and pediatric cancers.
Dr. Tsuji has several peer-reviewed publications and presentations and is affiliated with the American College of Radiology, Radiological Society of North America, American Society of Therapeutic Radiology and Oncology, the American Brachytherapy Society and American Society of Clinical Oncology. He holds two patents and was honored by the Radiological Society of North America with the Roentgen Resident/Fellow Research Award in 2009.
Dr. Tsuji also has a PhD in Chemical Engineering from Stanford University.
Anthony L. Michaud, M.D.
Dr. Anthony L. Michaud is a Radiation Oncologist with The Queen’s Medical Center’s Department of Radiation Oncology. He is trained in all disease sites, though his primary focus is lung, gastrointestinal, sarcoma and skin cancers. His secondary focus is gynecologic, and head and neck cancer. Dr. Michaud has several peer-reviewed publications and presentations and is affiliated with American Society of Therapeutic Radiology and Oncology. He is Board Certified by the American Board of Radiology.
Prior to his medical training, Dr. Michaud obtained a master’s degree, and PhD degree in chemistry from Cornell University. He also worked as a postdoctoral fellow at the University of British Columbia, and later as an assistant research scientist at Arizona State University’s School of Earth and Space Exploration.
Christina Spiers, M.D.
Vanderbilt Medical School, Doctorate of Medicine
Vanderbilt Medical School, Doctor of Philosophy, Biological Sciences
Siteman Cancer Center; Washington University Barnes-Jewish Hospital, Resident, Radiation Oncology
Dr. Christina Spiers is a Radiation Oncologist with Cancer Center of Hawaiʻi.
Richard Y. Lee, M.D.
Virginia Commonwealth University, Doctorate of Medicine
Georgetown University Medical Center, Post-Doctorate, Oncology
Georgetown University, Washington, D.C, Ph.D. Physiology & Biophysics
Roswell Park Cancer Institute, Resident, Radiation Oncology
University at Buffalo, SUNY, Intern, Internal Medicine
Dr. Richard Lee is a Radiation Oncologist with Cancer Center of Hawaiʻi.
Why Choose Gamma Knife Center?
Find out why so many patients seek out our cutting-edge Hawaii facility.
Get the Facts
Learn more about Gamma Knife success rates.