Meet The Team

Castleton Orthodontics photo of Dr Krull

Dr. John Krull


Dr. John Krull’s primary goal is to create both a functional and aesthetic smile. He is devoted to the wonderful patients and families he has had the pleasure to know over the years.

Dr. Krull moved to Indiana from Woodland Hill, California when his father made the decision to start his second career at the Indiana School of Dentistry ultimately specializing in Orthodontics.

Dr. John attended Indiana University Bloomington for his undergraduate studies graduating with a major in biology and a minor in chemistry. He graduated with distinction from Indiana University School of Dentistry. Dr. Krull was elected to Who’s Who Among Students in American Universities and Colleges as well as Omicron Kappa Upsilon dental honor society for academic excellence.

After graduation, Dr. Krull completed a two-year Orthodontics and Dentofacial orthopedics program at Indiana University School of Dentistry. He has also served as an associate professor at the IU Dental School, authored a chapter on Orthodontic Diagnosis in an international textbook, served as president of the Indianapolis District Dental Society, the Indiana Orthodontic Alumni association, and the northside Dental Study Association.

Dr. Krull currently lives in Lawrence township where he serves the community by raising money to enhance the learning experience for Lawrence Township students.

Castleton Orthodontics photo of Dr Holland

Dr. Robert Holland


Dr. Rob completed his dental and orthodontic training at the Indiana University School of Dentistry. He has a keen interest in dental and orthodontic research and has authored and coauthored several publications. In his free time, he likes video games, salsa dancing, woodworking and running. He is proud to bring to Castleton Orthodontics his expertise in clear aligner treatment as well as to integrate his knowledge of 3d dentistry. 


Debbie has worked in orthodontics for 35 years and with Castleton Orthodontics for 23 years. She is a proud mother of three sons and has five wonderful grandchildren.


Jennifer graduated from PCI in 2000 with a dental assisting diploma. She has loved dentistry since she was a child going to the dentist. She loves her career as a dental assistant and really enjoys making a difference in our patients’ smiles.


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-Bio coming soon-


Tonya has been enjoying her job and adoring our patients for 30 years. She believes seeing a patient go from hiding their smile to smiling with confidence is amazing. Tonya is very close with her family and has five wonderful grandbabies that she loves to spoil.

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