Meet the doctors



Dr. Fredric R. Warren attended the undergraduate program at the University of the Pacific in Stockton and then attended dental school at the University of the Pacific in San Francisco. He graduated from the University of the Pacific in 1981 and attended a two-year master’s program at UOP, and has been specializing in orthodontics since 1983.

Dr. Warren joined the family practice and worked with his father, Dr. Leonard Warren, for seventeen years.  He regularly attends orthodontic continuing education courses regarding new techniques and technology in orthodontic treatment.
After 30+ years, he still loves creating beautiful smiles! In his spare time, he enjoys the BBQ (awesome ribs & pulled pork), gardening, golfing with his 3 sons and going to Giants & Niner games. He also loves cooking & hiking with his wife, Debbie, of 35 years!

He enjoys spending time with his three grand-kids, Everly, Brooke and Bode.



Dr. Karin Chima-Shuster earned her Bachelor of Science degree from the University of the Pacific, where she graduated magna cum laude. Dr. Karin went on to receive her Doctorate of Dental Medicine degree (DMD) from the Harvard School of Dental Medicine.  She remained at Harvard to complete an Orthodontics Residency program.  During her seven years at Harvard University, she was actively involved in patient care, lecturing, teaching, and community service. Dr. Chima-Shuster was concurrently awarded a Master of Medical Sciences degree in Oral Biology and a certificate in Orthodontics from the Faculty of Medicine of Harvard University.  While at Harvard University, she received intensive training in the latest evidence based orthodontic treatment philosophies and techniques, which she now uses on a daily basis in caring for her patients.  She has been practicing orthodontics for the past 13 years and loves every minute of it!

Dr. Chima-Shuster lives in the Forest Hill neighborhood of San Francisco with her husband, Dr. Vlad Shuster, and their boys Naveen and Isaac.