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Our Dentists

Robert H. Breckinridge, DMD

A graduate of Middlebury College and the University of Connecticut School of Dental Medicine and Saint Francis Dental Residency program, Dr. Robert Breckinridge participates in numerous continuing dental education programs and is a Fellow in the Academy of General Dentistry. He has been named a Hartford Magazine’s Top Dentist numerous times.

He is a member of the American Dental Association, the Connecticut State Dental Association, Hartford Dental Society, and the Academy of General Dentistry.

Dr. Breckinridge is a lifelong and active resident of Avon and was selected as Avon Citizen of the Year in 2011. He was president of the Avon Land Trust for 7 years and currently is on their board of directors. As part of his love of nature, he has served on the Avon Natural Resources Commission and the Avon Wetlands Commission. He lives in Avon with his wife and has one daughter. He enjoys golf, tennis, boating and skiing.



Peter J. Knowles, DMD

Dr. Peter Knowles is a Master in the Academy of General Dentistry, having previously graduated from the University Of Connecticut School Of Dental Medicine. He has completed an intensive program at the Dawson Center for Advanced Dental Study. Dr. Knowles was listed as a contributor to an article on ‘Dental Implants’ in Dentistry Today. He has received recognition as a Greater Hartford Top Dentist for numerous years.

Dr. Knowles is active in the community and enjoys playing the guitar and gardening at his home in Niantic where he lives with his wife and has two children.



Daniel B. Geelan, DMD

Dr. Daniel Geelan has been with Avon Dental Group for 26 years and personally knows the positive, life changing impact dentistry can have when as a child he had his own teeth repaired following several sports related injuries. Through the process, he loved that the dental profession was the perfect combination of art, science, medicine, engineering, and social interaction. Getting his smile back had such a profound impact that it became the primary reason for him entering the dental profession himself.

Dr. Geelan is a distinguished graduate of the University of Notre Dame and the University of Connecticut School of Dental Medicine. He completed a General Practice Residency through the Veterans Administration Hospital in West Haven in affiliation with the Yale School of Medicine and the Hospital of St. Raphael. He is an active member of the American Academy of Cosmetic Dentistry, a member of the American Dental Association, Academy of General Dentistry, Connecticut State Dental Association, Hartford Dental Society, and is a Certified Invisalign provider.

Dr. Geelan actively participates with various international dental mission projects. Dr. Geelan lives with his wife in Canton and has four children, two of whom now live and work in Boston.



Gregory J. Solof, DDS

Dr. Gregory Solof has been with the Avon Dental Group since 2002. Dr. Solof is a graduate of Brandeis University and the University of Michigan School of Dentistry. He completed a General Practice Residency at Danbury Hospital in affiliation with the Yale University School of Medicine. He was awarded his Fellowship in the Academy of General Dentistry in 2009 and is currently working towards his Mastership award. Dr. Solof is a member of the American Dental Association, Connecticut State Dental Association, and the Hartford Dental Society. He is a certified Invisalign provider. As a member of the American Academy of Implant Dentistry he enjoys placing and restoring dental implants.

He lives in Avon with his wife and two children.



Claire G. Fagan, DMD

Dr. Claire Fagan joined Avon Dental Group in 2007, beginning her dental career as a dental assistant. After working there for 2 years, she decided to return to school to pursue her Doctorate in Dental Medicine.

Dr. Fagan is a graduate of the University of Connecticut and the University Of Connecticut School of Dental Medicine. She completed a General Practice Residency at Hartford Hospital. Dr. Fagan is a member of the American Dental Association, Connecticut State Dental Association, Hartford Dental Society, and the Academy of General Dentistry and is currently working towards her Fellowship award.

She lives in Simsbury with her husband, Ben, and son, Peter.


Dorsa Semsar, DMD

Dorsa Semsar is a doctor of dental medicine at Avon Dental Group. She gained her educational experience with a bachelor's degree in biology from the University of California before moving on to Boston University Henry M. Goldman School of Dental Medicine, where she received her doctoral degree in medicine. From there, she moved to the University of Connecticut School of Dental Medicine, where she completed advanced education in general dentistry. She completed her general dentistry residency at UConn Health AEGD Treatment Center in 2022.

Dr. Semsar is passionate about dentistry and helping others achieve optimal oral health. Additionally, she is honored to help new dentists learn the art and science of dentistry.


James McIntosh, DDS

Dr. James McIntosh is an endodontist at Connecticut Endodontic Associates. He began his journey to dentistry in 2007 at California State University of Northridge, where he studied biology. From there, he moved on to the University of the Pacific Arthur A. Dugoni School of Dentistry, where he graduated with a doctor of dental surgery degree in 2017. Further, in 2020 he earned his master of science in dentistry.

Dr. McIntosh has spent a number of years researching biomedical science and endodontics and has more recently had the opportunity to be a traveling endodontist, where he's been able to work with a variety of patients and dental professionals.