Sonoma County Indian Health Project Dental Provider Team

Getting to know your Dental Providers
Phone: (707) 521-4600

Joel Berryhill DDS, Dental Director

Dr. Joel Berryhill attended the University of Oklahoma for his undergraduate studies and the University of Missouri for his dental degree. Dr Berryhill joined the Sonoma County Indian Health Project family in 1997. Prior to moving to California, he had a private practice in Tulsa Oklahoma for 25 years. He enjoys golf, his garden, traveling, and spending time with his grandchildren. It has been a rewarding experience for Dr. Berryhill to see SCIHP’s dental department and the organization grow to serve our community.

Asterita Machado, DMD

Dr. Machado went to Centro Escolar University, Manila, Philippines for her undergraduate work and for her dental school education earning a degree Associate in arts and DMD, respectively. Dr. Machado has worked in a private practice for 17 years in her home country. Dr. Machado moved and lived in Ontario, Canada for 4 years before emigrating to the United States in 2002. Prior to joining Sonoma County Indian Health Dental Department in 2008, she worked in a private practice. She has been working full time at SCIHP since 2008. Dr. Machado loves to bake and enjoy food, wine and traveling with her husband.

Amy Wong, DDS

Dr. Wong earned her Bachelor of Science degree in Molecular Cell Biology from University of California in Berkeley. Dr. Wong then received her doctoral degree from University of Southern California School of Dentistry in 2003. Dr. Wong is a proud dental team member since 2006 and enjoys providing dental care to patients at Sonoma County Indian Health Project. Aside from her profession, Dr. Wong enjoys traveling and spending time with family.

Joseph Rutkowski, DDS

Dr. Joseph Rutkowski is a general dentist who obtained his degree from the University of Pittsburgh School of Dental Medicine in 2007. After graduation Dr. Rutkowski joined the dental team here at Sonoma County Indian Health Project. He has been caring for this community for eleven years. In his down time, Dr. Rutkowski enjoys traveling the world with his wife and daughter. His hobbies include cycling, painting and listening to his record collection.

Katie Marsh, DDS

Dr. Katie Marsh is an orthodontic specialist and Diplomate of the American Board of Orthodontics. A Bay Area native, she spent eleven years at the University of Southern California completing a BS in Neuroscience, DDS degree, and Orthodontic training, in which she also earned a Master of Science degree in Craniofacial Biology. Dr. Marsh joined the dental team at Sonoma County Indian Health Project in 2020. In her free time, Dr. Marsh enjoys hiking California's highest peaks, training for marathons, playing soccer, and skiing.

Gemma Ferrer, DMD

Gemma Ferrer,DMD graduated from the University of Pittsburgh School of Dental Medicine in 1995. Then at Columbia University College of Dental Medicine, she completed a 2 year fellowship in advanced dentistry. She stayed at Columbia dental school, employed at a satellite health center in Washington Heights, NYC. In 2000, she moved to Houston, TX and worked in private practice. She returned to her home base in the Bay Area in 2007 and worked at the South of Market Health Center in San Francisco for 12 years. She joined the Scihp dental team in April 2020. She volunteers with the Magic Tooth Bus, a non-profit organization developed to provide access and dental care to low-income children and families of San Francisco.