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About Us

Priscilla Chang, M.D. Ph.D.

Priscilla Chang, M.D. Ph.D. joined PSMG in 2009 following residency and fellowship training at Brigham and Women’s Hospital.  She attended Harvard University for her undergraduate education.  Her medical and doctoral degrees are from the University of Texas, Southwestern Medical School in Dallas.  Dr. Chang is board certified in Anatomic and Clinical Pathology and Hematopathology.

Rebecca L. Johnson, M.D.

Rebecca L. Johnson, M.D. earned her undergraduate degree at the College of Saint Benedict in St. Joseph, Minnesota, and her medical doctorate at the University of Minnesota.  She completed pathology residency and surgical pathology fellowship training at University of California, San Diego, followed by Hematopathology fellowship training at Scripps Green Hospital. Dr. Johnson joined PSMG in 2016 and is board certified in Anatomic and Clinical Pathology and Hermatopathology.

Nelson K. Kaneishi, M.D.

Nelson K. Kaneishi, M.D. attended the University of Washington in Seattle for his undergraduate and medical education.  He completed residency training in Anatomic and Clinical Pathology at the University of California Davis Medical Center, followed by a dermatopathology fellowship at the University of Texas, Southwestern Medical School in Dallas under Dr. Clay Cockerell. He joined PSMG in 1996. Dr. Kaneishi is board certified in Anatomic and Clinical Pathology and Dermatopathology.

Anthony Nasr, Ph.D., M.D.

Anthony Nasr, Ph.D., M.D. is a graduate of the University of California, Berkeley. He completed his doctoral degree in Anatomy at Albert Einstein College of Medicine in New York and Medical training at the University of Miami School of Medicine. He completed his residency in Anatomic and Clinical Pathology at the University of California, San Francisco, where he served as Associate Clinical Professor of Pathology before coming to PSMG in 1993.

Siavash Samimi, M.D.

Siavash Samimi, M.D. earned his medical doctorate from University of  California, Davis and completed his residency at Houston Methodist  hospital. He completed cytopathology and surgical pathology fellowships  at Houston Methodist and M.D. Anderson Cancer Center, Houston, TX and  is board certified in Anatomic and Clinical Pathology, in addition to  Cytopathology. Dr. Samimi served as a staff pathologist in Albuquerque,   New Mexico prior to joining PSMG in 2020.

Geoffrey Sasaki, M.D.

Geoffrey Sasaki, M.D. joined PSMG in 2013 after serving 14 years active duty in the U.S. Air Force.  He earned his medical degree from the Uniformed Services University of the Health Sciences.  After completing an internal medicine internship, he served as a flight surgeon in Albuquerque, NM.  He then went on to complete his anatomic and clinical pathology residency at Wilford Hall Medical Center in San Antonio followed by a dermatopathology fellowship at the prestigious Armed Forces Institute of Pathology (AFIP).  As a staff pathologist , he served as the Chief of Anatomic Pathology and Chief of Dermatopathology at the 2nd largest Air Force medical center.  Dr. Sasaki is board certified in Anatomic and Clinical Pathology and Dermatopathology.

Lester K. Wong, M.D.

Lester K. Wong, M.D. has been with PSMG since 1986, following a fellowship in Surgical Pathology at the Hospital of the University of Pennsylvania. His medical degree is from Northwestern University Medical School, and his residency training in Anatomic and Clinical Pathology was at the University of California, Davis, Medical Center. Dr. Wong is board certified in Anatomic and Clinical Pathology.

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