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Meet the Doctors

Dr. Timothy A. Theisen

Dr. Theisen is a native of Sugar Grove, Illinois. He received his Bachelor of Science degree from St. John’s University and his dental degree from Northwestern University Dental School. He earned his Masters of Science degree in orthodontics and completed his orthodontic specialty residency at the University of Illinois.

In 1989, Dr. Theisen joined Dr. Daniels’ office. Dr. Theisen is a member of the American Dental Association, Illinois State Dental Society, Winnebago County Dental Society, American Association of Orthodontists, Midwest Society of Orthodontists, Illinois Society of Orthodontists and other professional organizations. His orthodontic research has been published in The American Journal of Orthodontics and Dentofacial Orthopedics, a highly respected international journal.

Dr. Theisen has lectured at the American Association of Orthodontists annual conference and is active in continuing education. He is also a fellow of the World Federation of Orthodontics and a member of Omicron Kappa Upsilon honor society. He enjoys nature, physical fitness, sports, reading, photography and spending time with his family. He and his wife have one daughter and reside in Rockford.


  • Graduate Northwestern University School of Dental Medicine, D.D.S.
  • Graduate University of Illinois School of Dentistry, M.S.
  • Certified in Orthodontics


  • AAO-American Association Orthodontics
  • ISDS-Illinois State Dental Society
  • ADA-American Dental Association
  • MSO- Midwestern Society of Orthodontists
  • ISO- Illinois Society of Orthodontists

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