Dr. Kenworthy attended Brigham Young University for his undergraduate education. He received his BDS and DDS degrees from the University of California at San Francisco. He then practiced general dentistry in Montana before going back to obtain three years of specialty training, an orthodontic certificate, and a Masters degree in orthodontic treatment from the Mayo Graduate School in Medicine. Apart from practicing orthodontics, Dr. Kenworthy also lectures other orthodontists, teaching them his techniques to improve the care of their patients.

Dr. Kenworthy is an active member of the American Association of Orthodontists, the European Orthodontic Society, the Rocky Mountain Society of Orthodontists, the Montana State Orthodontic Society, the American Dental Association, and the Montana Dental Association. He has served as president of the Montana 3rd District Dental Society, the Montana State Orthodontic Society, and the Rocky Mountain Society of Orthodontists and he has been inducted into the International College of Dentists.

In addition to publishing numerous articles in scientific literature including the Journal of Orofacial Pain, the Journal of Prosthetic Dentistry, the European Journal of Orthodontics, and the American Journal of Orthodontics and Dentofacial Orthopedics as well as presenting his research at scientific meetings in the United States, Canada and Europe, Dr. Kenworthy has published poetry, coached semi-professional baseball, written a few novels and led Boy Scout troops. Dr. Kenworthy, his wife, and their five boys enjoy hiking, four-wheeling, camping, water skiing, and traveling.