About our office

We know how hectic life can be and are committed to making our practice convenient and accessible. And we want you to feel confident that when you choose Leopold, Murphy and Main, you're working with doctors and other professionals who are qualified, experienced and caring.

Certifications & Memberships

Meet our team

Dr. Mark Leopold Read Bio

Dr. Mark Leopold has been practicing general dentistry in San Luis Obispo with his partner (and brother-in-law) Nicholas Murphy, DDS, since 1977. After serving a tour in Vietnam, he attended Cuesta College and Cal Poly. He received his doctorate in dental surgery from the University of the Pacific in San Francisco. He continues to strengthen his skills by attending educational courses on a regular basis. He and his son Dr. Ian Leopold completed a 1-year Fellowship Program in Implant Dentistry wi...Read More

Dr. Nicholas Murphy Read Bio

Dr. Nicholas Murphy was born and raised in San Luis Obispo, graduated from Mission High School, attended Cuesta College and graduated from Cal Poly University. He received his doctorate in dental surgery from the University of California, San Francisco and has been practicing dentistry in SLO since 1977 with his brother-in-law, Dr. Mark Leopold. Dr. Murphy has had extensive postgraduate training in cosmetic dentistry and dental rehabilitation with Pac-Live, University of the Pacific School of De...Read More

Dr. Craig Main Read Bio

Dr. Craig Main completed his undergraduate degree in Biology at the University of California, Santa Barbara, and his DDS at Loma Linda University School of Dentistry. He and his family returned to the central coast in 2003 to join the practice of Mark Leopold and Nicholas Murphy. Dr. Main's dedication to excellence in dentistry is evident by his commitment to continuing education. He has undergone extensive continuing education in the areas of orthodontics and endondontics to enable him to provi...Read More

Dr. Ian Leopold Read Bio

Dr. Ian Leopold has followed in family tradition, joining his father Dr. Mark Leopold and uncle Dr. Nicholas Murphy as a dentist in our San Luis Obispo practice in the fall of 2010. Ian grew up in San Luis Obispo and received his bachelor’s degree in biology from Cal Poly. While attending school, he worked in our dental lab preparing crowns and other restorations. He returned to the practice after graduating with honors from the University of the Pacific School of Dentistry in 2010. In addition ...Read More

Dr. Sienella Thomaszadeh Read Bio

Dr. Thomaszadeh grew up in the San Fernando Valley of CA where she began her career in the field of dentistry as a dental assistant in 1999 and continued to do so for 9 years before attending New York University (NYU) College of Dentistry. She received her Bachelors in Biology prior to Dental School from UCLA in 2005. Dr. Thomaszadeh was a volunteer dentist for the Bellevue/NYU Program for Survivors of Torture (PSOT) where she provided ideal dental care at no cost for a group of survivors of tor...Read More

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Services we provide

At SLO Smiles we strive to provide our patients with the best and most complete dental care. Our doctors and staff frequently attend continuing education seminars to learn the latest dental techniques. Here are some of the services we provide, please click here.

Payment Forms

We offer a number of convenient payment options for our patients which make it easy to afford any care you may need.

American Express, Care Credit, Cash, Check, Mastercard, Visa

Languages Spoken

  • English