Sean L. Johnston, MD, PhD, a Radiologist with Adventist Health White Memorial

Get to know Radiologist Dr. Sean L. Johnston, who serves patients in Los Angeles, California.

Attributing his success to perseverance, Dr. Johnston is a board-certified radiologist who serves patients within the Diagnostic Imaging Department at Adventist Health White Memorial in Los Angeles, California. 

As the region’s leading faith-based, nonprofit teaching hospital, Adventist Health White Memorial strives to inspire wellness and treat medical conditions using the latest technology, equipment, and techniques. The team of highly trained and experienced doctors, nurses, surgeons, and countless other medical professionals goes to work each day with one goal: to help patients heal. They believe in treating each patient as a whole, offering physical, emotional, and spiritual care.

After earning his medical degree and his Doctorate (PhD) degree with a focus on transplant immunology from the Mayo Clinic Alix School of Medicine, Dr. Johnston went on to complete his surgical fellowship at the same educational venue. He subsequently completed his internship in internal medicine at UCSF Fresno, before going on to complete his residency in radiology and his fellowship in vascular & interventional radiology at the University of California, Los Angeles (UCLA).

During his training at UCLA, he was honored with one of five nationwide educational scholarships from Bracco Diagnostics and was named one of their Leaders on the Horizon.

With an impressive professional journey filled with numerous achievements, the doctor is board-certified in diagnostic radiology and interventional radiology by the American Board of Radiology, which is a not-for-profit physician-led organization that oversees the certification and ongoing professional development of specialists in diagnostic radiology, interventional radiology, radiation oncology, and medical physics. He also has extensive experience designing and building teleradiology systems for imaging and medical centers, including implementation of digital dictation.

Radiology is a medical specialty that uses medical imaging to diagnose and treat diseases within the human body. Radiologists are medical doctors who specialize in diagnosing and treating injuries and diseases using medical imaging procedures, such as exams and tests, X-rays, computed tomography, magnetic resonance imaging, nuclear medicine, mammography, positron emission tomography, and ultrasound.

Outside of practicing medicine, Dr. Johnston enjoys spending time with his children. His favorite professional publications are the New England Journal of Medicine and the Journal of the American Medical Association.

Learn More about Dr. Sean L. Johnston:

Through his findatopdoc profile, or through Adventist Health White Memorial,


FindaTopDoc is a digital health information company that helps connect patients with local physicians and specialists who accept your insurance. Our goal is to help guide you on your journey towards optimal health by providing you with the know how to make informed decisions for you and your family.

Karen Johnson

Karen Johnson is an Associate Content manager for FindaTopDoc and responsible for working with distinguished physicians in documenting their significant accomplishments in their field. Karen is a CPR instructor and is a member of her local theater group.