Dental Staff

Dental Staff St. Charles, IL

All our professionals at John Isbrandt, D.D.S., P.C. maintain the highest levels of accreditation and pursue ongoing education to stay abreast of the latest trends in dentistry.


Dr. John Isbrandt, D.D.S

  Dr. Isbrandt graduated from North Central College in Naperville, IL in 1982 with a B.A in Biology.  He then attended the University of Illinois at Chicago where he received the Doctor of Dental Surgery(DDS) degree in 1986. 

  After graduating from dental school, he enlisted in the U.S. Public Health Service where he practiced dentistry with underserved populations in the United States for more than four years.

  Dr. Isbrandt started his first dental practice in 1992 in Bartlett, IL.   After 6 years, he transitioned his practice from Bartlett to St. Charles IL where the practice is currently located.

  In addition to his general dental license, Dr. Isbrandt has had extensive training in orthodontics including Invisilign, implantology and endodontics.  He also has had training on seperate occassions at the Mayo Clinic in Rochester, MN. and completed an externship at the U.S. Naval Hospital in Bethesda, MD.  Dr. Isbrandt enjoys performing all aspects of dentistry, but he paticularly enjoys cosmetics, orthodontics and Cerec(crowns in a single visit) restorations.

  Dr. Isbrandt is married with 3 adult children and resides in Campton Hills, IL.  In his spare time, he enjoys golf, hiking, snow skiing and biking.




Mary started in our office August 2009.  She's been in the Dental field for 11 years.  She truly enjoys working in a positive and comforting work enviroment and strives to provide everyone with an amazing experience in our office.  She and her husband have lived in Elgin all their lives and raised there 4 children there. She now has 7 grandchildren and loves to spend time with them.   Mary also enjoys going camping with her family and friends and her English Retriever, Major




Karen has been our chairside dental assistant since 2004 and employed as a dental assistant since 1987.  Karen is always smiling and loves getting to know our patients.  Karen's goal is to make sure all of our patients have a great experience and to make sure everyone's expectations are met.  In her spare time, Karen enjoys spending time with her family and likes to garden too.





Erin has been a dental hygenist with Dr. Isbrandt's office since graduating in 2006.  Having grown up in St. Charles, she decided to move back to the area after completing her BS degree in Dental Hygiene at East Tennessee State University.  Erin's kind disposition and vast dental knowledge leaves her patients in the best of hands.  In her spare time she helps take care of her Grandparents, enjoys reading books, and tries to turn her brown thumb green in the garden.





Gaby has worked in the dental field since 2009.  She graduated from College of Dupage with a hygiene degree in 2014.  Gaby lives in Elburn with her daughter, Chloe and her other daughter of the four-legged type, a german shephered named Lola.  Gaby's quick wit and enthusiam makes for an enjoyable dental visit.  She enjoys cooking and the occasional book, although, Gaby will admit to turning on the tv quicker than she will turn the pages of the latest novel. 





Michelle graduated from Marquette University in 1990 with a bachelors degree in dental hygiene.  She has been practicing hygiene in the Fox Valley area for the past 18 years.  The most enjoyable part of Michelle's job is working with patients.  She finds that creating a trusting relationship with her patients as well as providing valuable dental health is of the utmost value.  She stays active in her spare time with family and friends and enjoys cross training, reading and traveling.