John M. Collier, D.D.S.

Dr. John graduated from the University Of Minnesota School of Dentistry in 1973. After graduation, he completed a two year residency in Pediatric Dentistry at Eastman Dental Center in Rochester, New York. In 1975, Dr. John started his own practice in St. Cloud, Minnesota.

In addition to working at K.O.A.L.A Dental Care, Dr. John also enjoys teaching at the University of Minnesota.  In 1997, he became a faculty clinician at the University of Minnesota in the Division of Pediatric Dentistry. There he began an extensive course for the graduate residents covering interceptive and comprehensive orthodontics, space maintenance and a host of other practical dental topics.

When Dr. John is not practicing dentistry, you can find him entertaining his grandchildren or spending time at his log cabin in Brainerd. His home away from home provides him with a great place to dabble in his other hobbies such as woodworking, fishing, hunting and boat building.

Dr. John is a member of the following:

  • American Academy of Pediatric Dentistry

  • American Dental Association

  • Minnesota Academy of Pediatric Dentistry

  • Minnesota Dental Association

  • The American Orthodontic Society


J. David Collier, D.D.S.

Dr. David followed in his father's footsteps and graduated from the University of Minnesota. After completing his pediatric residency, he participated in a rotation through the Gillette Specialty Children's Hospital in their outpatient and inpatient areas. This provided the opportunity to spend additional time with the cleft palate and craniofacial team, and Dr. David has since joined their team as a staff clinician.

When Dr. David is not working at K.O.A.L.A Dental Care or Gillette Children's Hospital, he enjoys spending time with his wife and three children, two daughters and one son. They also enjoy their two dogs. He combines family life with his other passion, sports. Together they attend Gopher games, ski and enjoy the outdoors.

Dr. David is a Diplomate of the American Board of Pediatric Dentistry. In addition, he is a member of the following:

  • American Dental Association

  • American Cleft Palate-Craniofacial Association

  • Minnesota Academy of Pediatric Dentistry

  • Minnesota Dental Association

  • The American Orthodontic Society


Aruna Rao, D.D.S.

Dr. Rao earned a Bachelor of Science degree in Biomedical Engineering from the University of Minnesota in 2007. She then received a Doctor of Dental Surgery degree from the University of Minnesota School of Dentistry in 2012. Her Advanced Education Program in Pediatric Dentistry was completed at the University at Buffalo School of Dental Medicine in Buffalo, New York. Dr. Rao has received training in IV and conscious sedation and has experience in general anesthesia. She has served on the Legislative Affairs and Scientific Sessions Committees with the Minnesota Dental Association, and has participated nationally with the American Student Dental Association. She is an active volunteer, participating in various city events, the annual 'Give Kids a Smile' day event, and has participated in Remote Area Medical, providing dental care to underserved populations.

A Midwesterner at heart, she enjoys spending time with friends, being outdoors, running, yoga, Twins baseball, Golden Gopher hockey, and playing with her bunny rabbit, Pierre.

Dr. Rao is a member of the American Academy of Pediatric Dentistry, American Dental Association, Minnesota Dental Association and the Academy of General Dentistry.


Emma Zimmerman, D.M.D.

Dr. Emma is originally from St. Cloud, Minnesota. She attended the University of Minnesota for her undergraduate studies where she received a B.S. in Biology. Dr. Emma then spent one year teaching 4th-8th grade students math at Kennedy Elementary in St. Joseph, Minnesota. Dental school brought her all the way to Tufts University School of Dental Medicine in Boston, Massachusetts, earning her Doctor of Medicine in Dentistry degree. She then returned to the University of Minnesota to complete a specialty program in pediatric dentistry.

Outside of dentistry, Dr. Emma enjoys spending time on the lakes, with family and friends, and with her Australian Shepherd, Alfonso. Dr. Emma is excited to begin her career at K.O.A.L.A. Dental Care alongside her lifelong mentors, Dr. John Collier and Dr. David Collier. She looks forward to serving the community in which she grew up.

Dr. Emma is a member of the American Academy of Pediatric Dentistry, the Minnesota Dental Association, and the American Dental Association.

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Pediatric Dentist, St. Cloud, Buffalo and Baxter, MN   Drs. John Collier & David Collier.  Serving patients in the surrounding cities and areas of St. Cloud, Buffalo, Baxter,
Waite Park, Sartell, Sauk Rapids, Monticello, Buffalo, Little Falls and St. Michael,  Minnesota.

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