About Our Doctors

Dr. Mark Paciorek


Dr. Mark Paciorek has been practicing orthodontics for over 20 years! He received his Bachelor of Science degree in pharmacy from Albany College of Pharmacy and worked as a pharmacist prior to and during dental training. He attended the University of Buffalo Dental School for both his dental degree and specialty training in orthodontics at the master’s level, graduating at the top of his class.

In his pursuit of continued excellence, Dr. Paciorek has attend numerous continuing education programs throughout the years to maintain and deliver the highest quality of care, and, because of his relentless pursuit of excellence, he is a frequent lecturer, sharing his orthodontic expertise at dental society meetings and dental study clubs throughout North America.

He is a member of the American Association of Orthodontists, Northeast Society of Orthodontists, American Dental Association, Fifth District Dental Society, Onondaga County Dental Society, Omicron Kappa Upsilon Honor Society, and co-chair of the Upstate New York Dentofacial Abnormalities Group.

In his spare time, Dr. Paciorek enjoys playing golf and spending time with his family.

Dr. Rodney Littlejohn


Dr. Rodney D. Littlejohn is a native of Seneca Falls and a graduate of Mynderse Academy. He is also a graduate of St. Bonaventure University. He received his Doctorate of Dental Surgery (with honors) from Georgetown University School of Dentistry in 1979, and completed a one-year dental residency at Rochester General Hospital. Dr. Littlejohn obtained his graduate orthodontic certificate in 1982 and his Master of Science in 2009, both from the University at Buffalo School of Dental Medicine.

Dr. Littlejohn is a clinical assistant professor at the University at Buffalo School of Dental Medicine. He also lectures to orthodontic residents and practitioners throughout the United States on practice development, patient care, and practice management.

He maintains active memberships with the New York State Dental Association, American Dental Association, Northeastern Society of Orthodontists, American Association of Orthodontists, and World Federation of Orthodontists.

Dr. Littlejohn has been in the private practice of orthodontics since 1982. He made the decision to base his orthodontic practice on three very simple principles: quality care, personal service, and reasonable fees. By always holding true to these principles, Dr. Littlejohn and his staff have been able to excel at meeting the orthodontic needs of area residents.

Dr. Ariana Weissend


Dr. Weissend grew up in Rochester, NY. She attended dental school at the University at Buffalo, and completed her orthodontic residency at the University of Minnesota. Following her training, Dr. Weissend moved to Denver, CO where she enjoyed her first few years of practice in view of the Rockies. Despite loving the mountains and the adventure, she ultimately missed the lakes and her family at home. She is excited to be back in upstate NY, and looks forward to immersing herself in the Ithaca community. We could not have found a better person and Orthodontist to serve our mutual patients. Her personality, experience and training are all top notch!