Dr. Johnson began practicing family dentistry in 1976 after graduating the University of California San Francisco school of Dentistry. His view of dentistry widened almost immediately as he explored a more comprehensive approach to treating patients, which included orthodontic and TMJ/CMD treatment.

Over the course of his career, Dr. Johnson has been a member of the California Dental Association, the American Dental Association (ADA), the American Academy of Craniofacial Pain (AACP), the American Italian Dental Association (AIDA), the Glendale Academy of Dentists, San Fernando Valley Dental Society, Orthopedic Gnathology Study Group, San Gabriel Valley Implant Study Group, and a charter member of the American Association for Functional Orthodontics (AAFO).

In addition to activities of the above organizations, Dr. Johnson has advanced his education and enhanced his practice through numerous educational courses, seminars, and study groups. He is founder and facilitator of the Southern California Dental-Cranial Study Group and routinely attends meetings for the Glendale Academy, the Implant Study Group, and the American Italian Dental Association. He participates in annual conferences for the organizations above as well as for those such as the International Association for Facial Growth Guidance, the Holistic Dental Association, Mid America Orthodontic Society, and BioResearch.

He has provided presentations for the Southern California Health Sciences University, San Gabriel Valley Dental Implant Study Group, USC Orthodontic Alumni Study Club, California Dental Association, and Sacro Occipital Techniques Organization on lecture topics such as TMJ for Chiropractors, Occlusal Splint Therapy, Muscle and Joint Parameters in TMJ patients, Altering Occlusion for Periodontal Health, and the Dental-Chiropractic Co-Treatment Paradigm.