Dr. Theresa Holt graduated from the Creighton University School of Dentistry in 1987. She followed in the footsteps of two of her siblings who are also dentists and married her fellow classmate, Dr. Michael Holt. Dr. Theresa and Dr. Michael have been practicing dentistry in Fairfield for over 35 years. They have two children. Lauren is a violin educator at Punahou School in Honolulu where she resides with her husband, Dr. Austin Ako (a dentist); Michael is a student at Xavier University in Cincinnati, Ohio.

Dr. Theresa is a member of the American Dental Association, a lifetime member of the Iowa Dental Association, and a member of the Southeast Iowa District Dental Society. Within the community Dr. Theresa has served on the St. Mary Catholic Church Parish Council, Fairfield Community School District Vertical Team, St. Mary Preschool Board (past president), Xavier University Parent/Family Advisory Board (past president), Jefferson County Medical Dental Auxiliary, and is a member of PEO Chapter C. She currently serves on a committee through the Ottumwa Regional Legacy Foundation.