“My child patients amaze and inspire me and in turn I strive to serve them with tireless enthusiasm and positivity. I love enjoying each and every day because each day is a gift. It is an honor that parents entrust me with their children’s care. I try to make a personal connection with every child, every time.”
– Dr. Jon Sierk

Dr. Jon Sierk has been serving the children and families of Colorado since completing his pediatric specialty training in 2003. He is proud to be a diplomate of the American Board of Pediatric Dentistry.

After growing up in Bettendorf, Iowa, Dr. Jon graduated from Northwestern University in 1996 where he divided his time between studies and the varsity soccer team. He then returned home to attend dental school and complete his three year pediatric dental residency at the University of Iowa.

Dr. Jon comes from a family of dentists, his father and two brothers also graduated from the University of Iowa College of Dentistry. Dr. Jon has participated in medial mission work in many locations in the Dominican Republic, extracting teeth for underserved families in remote areas. Dr. Jon is on staff at the Children’s Hospital of Colorado and served as an adjunct professor in the training program there from 2001–2011. He is certified in Advanced Cardiac Life Support (ACLS) as well as Pediatric Advanced Life Support (PALS).

He volunteers time and resources to support Colorado families through local programs. In his free time, he loves to travel and hike with his fiancée Stacey, golf, read, keep up with his nieces and nephew, and cheer on the St. Louis Cardinals. Dr. Jon truly loves working with his child patients and is proud to have been named to "Denver's Top Dentists" by 5280 magazine yearly since 2011.


– Korby and Amy B.

Dr. Jon and his staff are knowledgeable, friendly, professional, and provide outstanding dental care for our two children, now ages 11 and 9. The staff consistently provides comprehensive treatments for prevention and dental needs on an individual basis, no matter the age. They speak to our children in terms they understand, and the staff’s friendly and kind demeanor motivate our children to take charge of their own dental health and care.  As parents, we strive to provide the best for our children, and with Sierk Pediatric Dentistry, we continue to receive the best, each and every dental visit. Thank you Dr. Jon and staff.



– Kevin F.

Simply put, Dr. Sierk and his staff are wonderful. My son has been going to Dr. Sierk for a long time and he has always received the best of care, and not just dental care, but care as a person. My son has learning disabilities and high-level autism, and Dr. Sierk and staff have always been the friendliest and most understanding dental professionals. We could never find the right dentist for our son and when we found Dr. Jon Sierk and his staff it was another great step forward in finding the type of excellent dental care he needs. Thank you Dr. Sierk, Ann, and all the dental technicians.