Dr. Johnston received his Bachelor of Science (B.S.) degree in Biology from Brigham Young University and Doctor of Dental Surgery (D.D.S.) degree from the University of Colorado at the Anschutz Medical Campus. He then pursued surgical training in Oral and Maxillofacial Surgery at the University of Tennessee Knoxville Medical Center. While in residency, he focused on the surgical and non-surgical management of facial trauma, head and neck cancer, benign pathology of the face and jaws, dentofacial deformities, obstructive sleep apnea, and temporomandibular joint disease. He also received training in general anesthesia, intravenous sedation, dental extractions, bone grafting, and dental implant placement. Following residency, he completed one year of fellowship training in Craniomaxillofacial Trauma and Reconstruction at the Duke University Medical Center in Durham, North Carolina. He is a diplomate of the American Board of Oral and Maxillofacial Surgery.

Dr. Johnston is currently stationed at Travis Air Force Base where he is an attending surgeon for the Oral and Maxillofacial Surgery Residency Program. He is actively involved in education as an Assistant Professor at the Uniformed Services University of the Health Sciences and is a contributing author to numerous journals and textbooks. He is a member of the American Association of Oral and Maxillofacial Surgery and holds certifications in BLS, ACLS, PALS, and ATLS. Dr. Johnston earnestly strives to provide evidence-based care that is ethical and compassionate.

He and his wife enjoy living in California where they seek adventure with their four energetic children.