About Us

Dental Center At Sears
1001 Sunvalley Boulevard
Concord, CA 94520


About Us

George F. Koerber, DDS, Owner






David R. Mullin, DDS, Periodontist

William R. Murphy, DDS, Oral & Maxillofacial Surgeon

Eric J. Herbranson, DDS, MS, Endodontist

Sharon Rufo, RDH

Janey Rodgers, Manager

Silvia Febo, Receptionist/Supervisor

Andrea Will, Receptionist, RDA

Vidya Verma, RDA

Lynli dela Cruz, RDA




Dr. Mullin is a native of the San Francisco Bay Area and received a degree in Biochemistry from the University of California in Berkeley in 1972. He attended the University of Maryland Dental School in Baltimore and graduated Magna Cum Lade in 1976. He then returned to the University of California in San Francisco for a year in residence in Hospital Dentistry. He practiced general dentistry in San Francisco for two years before again returning to UCSF for a two-year residency, receiving a certificate in Periodontology in 1981. He has practiced Periodontics for twenty-five years in the SF Bay Area with his primary solo practice in Mill Valley. He is a member of the Contra Costa and Marin Dental societies, the CDA, ADA, California Society of Periodontists and the American Academy of Periodontology.

Dr. Mullin provides a wide range of periodontal surgical services, including respective procedures for pocket elimination and crown lengthening as well as regenerative procedures for gingiva and bone for preservation of natural teeth and preparation of endentulous areas for dental implants. Dr. Mullin started with the Branemark system in 1986 and currently places Nobel Biocare internal connection implants in the partially and completely edentulous. Providing esthetic alternatives to tradional crown and bridge prosthodontics is his particular interest.   






Dr. Murphy attended San Francisco State University and graduated with a Bachelor of Arts degree in Biology in 1967. He attended Howard University College of Dentistry in Washington, D.C. and graduated number three out of a class of eighty students in 1972. He completed a three-year residency in Oral and Maxillofacial Surgery at Howard University in 1975 obtaining a Certificate in Oral Surgery. After thirty years of very successful solo private practice of Oral and Maxillofacial Surgery in Oakland, he has joined our group multispecialty and general dentistry practice here in Concord. We look forward to serving the Oral and Maxillofacial Surgery needs of our dental colleagues here in Contra Costa County.


Dr. Murphy is Board Eligible and a Fellow of the American Association of Oral and Maxillofacial Surgeons.

He is a member of the American Association of Oral and Maxillofacial Surgeons and the California Association of Oral and Maxillofacial Surgeons. He is also a member of the American Dental and California Dental Associations.



Dr. Herbranson graduated with a DDS degree from Loma Linda University in 1970 and a MS in Endodontics from Loma Linda University in 1973. He has practiced endodontics in the East Bay since that time.

He has been actively involved in education for years having given many lectures locally and nationally on endodontics as well as presentation skills and microscope photography. He is on the faculty of the University of the Pacific School of Dentistry and lectures at Loma Linda University School of Dentistry. He is an Opinion Leader for a major endodontic supply company and helped develop their corporate education protocols.  

He is nationally recognized in the endodontic field and his interest in photography has resulted in the creation of a small company that builds camera mounts for surgical operating microscopes.  Another of his interest is the development of a computerized atlas of the anatomy of human teeth.  It has been recognized as a significant tool in learning the complex microanatomy of teeth and is currently being adapted by many dental schools in the United States.  It can be viewed at www.toothatlas.com 

Affordable Dentistry For Adults & Children
State-Of-The-Art Comfort - Friendly & Caring Staff
Preventative & Periodontal Oriented Dental Practice

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