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Dr. Brehnan completed his orthodontic residency at the University of California – San Francisco. He has taught in the dental assisting programs at Contra Costa College and Diablo Valley college. Dr. Brehnan has published articles in numerous publications, such as The Journal of Dental Research, and he has presented research papers and national and international meetings, such as The International Association of Dental Research. He also appeared on an ABC TV show to discuss adult orthodontics.
Dr. Brehnan was a member of the Dental Delegations in 1990 that traveled to the then USSR. This delegation was instrumental in creating official exchange of research and assistance to the USSR.
Dr. Brehnan is married to Ilinka and father to Nicole, Alexander and Stefan. Dr. Brehnan loves being a father and being active in his children’s lives. In his spare time, he enjoys running, exercising, sailing and tennis.