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Meet The Doctors

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Mahdad Nassiri, DDS

Dr. Mahdad Nassiri has been practicing dentistry since 2007. He attended University of California Los Angeles where he obtained his Doctorate of Dental Surgery. Dr. Nassiri also completed specialty training in Periodontics at the Oregon Health and Science University.

Dr. Nassiri is a Diplomate of the American Board of Periodontology and completed a fellowship at the Institute for Advanced Laser Dentistry. He is also a member of the 
Academy of Osseointegration.

“My personal commitment to lifelong education has been helping me to stay updated with all new advances in my field and incorporating these technologies to provide my patients with the best possible treatment option in the most comfortable environment. It is most rewarding to educate and help my patients improve their oral and general health and see them satisfied with the standard of care they received in both professional and personal level.“

In his leisure time, he enjoys alpine skiing, cycling, hiking & nature photography.

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Mercedes Heitman, DDS

Dr. Mercedes Heitman has been practicing periodontics since 1982. Dr. Heitman received her dental degree from the University of Honduras in 1979 and then proceeded to complete a Certificate in Periodontics from the University of Oregon Health Sciences Center graduating in 1981.

Dr. Heitman relocated to California where she was an assistant professor at UOP Dental School (now Arthur A. Dugoni School of Dentistry) from 1982 to 1987. During this time period Dr. Heitman also practiced in the faculty practice at UOP.

In order to stay current in her profession Dr. Heitman takes multiple continuing education courses every year and is a member of the American Dental Association, California Dental Association, The California Society of Periodontology, The American Academy of Periodontology, The American Academy of Osseointegration, The Western Society of Periodontology and the Redwood Empire Dental Society.

Dr. Heitman moved to Petaluma in 1987 where she lives with her husband Jeff and are now empty nesters. She enjoys working and living in this most beautiful part of the country. Dr. Heitman’s hobbies are golf, hiking, motorcycle rides with Jeff and participating in dental community outreach in Mexico and Honduras. Dr. Heitman is now a proud grandmother of a little boy with a second grandson on the way.

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