Meet the Team

Meet the members of our extraordinary team by clicking on the links below.

Dr. Kellerman   |   Dr. Mahassek   |   Business Assistants    |    Hygiene Department   |  Dental Assistants


Dentistry From the heart Video
Our Mission

Commitment to giving each and every person the dignity, respect, and honor they deserve is important at Kellerman Dental in Glen Carbon, IL.  We also strive to thoroughly understand each person’s needs, concerns, and circumstances.

After recognizing the difficulty and reluctance that many people experience with dental treatment, we believe that each person deserves to be treated as a unique, individual person.

We know that the best professional care is delivered when the patient, doctor, and team partner together in an environment of understanding, communication and respect toward each other with the goal of complete dental and physical health.

Our office commits to providing only the best and most technically advanced dental care using only the highest quality materials and procedures delivered in an atmosphere of physical and emotional care and comfort.

We expect the doctor and every team member to be actively involved in the pursuit of the highest level of education available, to be thoroughly knowledgeable in the most recent technology, and to perform their duties with an exceptional degree of professionalism and competence.

Here at Kellerman Dental, we believe in delivering to each patient more than just a smile.



Dr Kellerman
Dr. Kevin J. Kellerman DMD

Dr. Kellerman is passionate about providing excellent comprehensive family dentistry. Whenever advanced technology is available to improve the quality or comfort of dental care, Dr. Kellerman has been ready to invest in it in order to provide the best dental experience for you and your family.

A Southern Illinois native, Dr. Kellerman was raised in Pinckneyville, IL. During his youth he enjoyed playing basketball, baseball, and running cross country. He decided during those years that he wanted to become a dentist, after taking note of the personal relationships his own family dentist formed with himself and the other residents in the community.

After graduating from Pinckneyville Community High School, Dr. Kellerman enrolled at Southern Illinois University in Edwardsville, and graduated with honors with a double major in biology and chemistry. Dr. Kellerman then enrolled at the Southern Illinois University School of Dental Medicine. It was here that Dr. Kellerman learned all of the basic skills it takes to become a well-rounded family dentist. He was one of two school representatives chosen by his peers to attend and represent SIU-School of Dental Medicine at an annual meeting of the nation's dental schools. It was at this conference where dental schools would collaborate and share ideas on how to make positive changes that would enhance the experiences of students and patients to the dental school curriculum. Dr. Kellerman graduated from SIU School of Dental Medicine with his doctorate in 2002, and has been committed to continuing his education ever since. He has been trained, holds membership, and/or is certified or accredited by the following organizations: Invisalign, American Orthodontic Society, Six Months Smiles, PAC-Live Aesthetic Continuum, DOCS-Conscious Sedation, Chen Laser Institute, Midwest Implant Institute, American Academy of Implant Dentistry, Academy of General Dentistry, American Dental Association, Illinois State Dental Association, Madison County Dental Society, and Greater St. Louis Dental Society. He is also a member of the Glen Carbon/Edwardsville Chamber of Commerce.

He currently practices full-time and has lectured on various topics at his alma mater. Dr. Kellerman feels like this gives him an opportunity to give back to the institution that has given him so much. Dr. Kellerman's team members also spend time in local middle schools educating the students about the importance proper oral hygiene plays in their daily lives as well as their overall health. He believes in being philanthropic, and has donated time, money, and services to those less fortunate who may be unable to afford or find appropriate dental care, and various organizations who are fundraising for good causes.

Dr. Kellerman is known for his thoroughness and attention to detail. He also ensures each and every patient knows all options available to them, and lets them choose the option they are most comfortable with. He feels confident that any work provided by Kellerman Dental Care will provide comfort, esthetics, and durability. He is thankful for all of the genuine compliments and feedback he and his team receive on a daily basis and the entire team uses those kind words as motivation to reach higher levels of service and care for their patients.

Dr. Kellerman enjoys spending his spare time with his lovely wife Amanda, and his three sons Oliver, Everett, and Wesley. He also enjoys running marathons, Crossfit, hiking, fishing, reading, traveling, and live music.


Dr Heather
Dr. Heather Mahassek DMD

Dr. Mahassek feels fortunate to be a part of the Kellerman Dental team, as she believes this practice truly embodies her core values of patient care which include compassion and high-quality care for her patients. Her passion involves working with children and making them feel at ease, but she also enjoys being in a family practice that allows her to care for people of all ages.

Dr Heather is proud to say she is from Glen Carbon, and has realized her dream of practicing in her hometown and serving the community she grew up in. While attending Edwardsville High School she achieved High Honor Roll status, and was involved in various organizations such as Key Club, Student Advisory Council, French Honor Society, Varsity Cheerleading, and the Fellowship of Christian Athletes.

The University of Illinois granted Dr. Mahassek her B.S. degree in Integrative Biology. While attending U of I she was involved in Varsity Athletics Cheerleading, was an honor student in the Pre-Dental Club, and served as a student teacher for a local 5th grade class.

Dr. Mahassek received her Doctor of Dental Medicine degree from Southern Illinois University School of Dental Medicine in Alton, IL. During this time she was a member of the American Association of Women Dentists and the Student Professional and Ethics organization. She feels fortunate to have attended a school close to home as it has enabled her to stay connected with the community by educating local schools on the importance of oral and dental heath, and volunteering at various events to provide dental treatment to underserved populations.

In her free time Dr. Mahassek enjoys sand volleyball, mystery novels, Cardinals games, and running in local races. One interesting fact about her is that she was a cheerleader during her four years at the University of Illinois, with her highlight being able to cheer on the Illini during the Rose Bowl in 2008.


Office Manager


Ashley Harris

Ashley has been in the dental field since 2011. She enjoys interacting with patients and customizing individual treatment plans to meet each patients needs. Ashley and her husband recently welcomed their first son Greyson in September 2014. She values spending quality time with her family on the weekends and relaxing pool side. Ashley is a hockey fan and enjoys watching and cheering on the St. Louis Blues. One interesting fact about Ashley is on her wedding day the church lost power due to a storm, but continued ceremony in the heat with doors wide open, candle light for guest book and a portable stereo for music.


Business Assistants

Nicki Phelps

Nicki has been in the Dental field since 2007. She likes seeing patients achieve a healthy nice smile and working closely with coworkers. In her free time she enjoys sitting by the pool reading fiction books on her kindle, and spending time with her first grandson Eli. Her children are very active with sports and she takes part in cheering them on at games. Nicki and her family are St. Louis Cardinals fans and attend many games during the regular season. One interesting fact about Nicki is that she has an accounting degree and her first given name is Crystal, but has always gone by Nicki


Danielle Schmidt- Business Assistant
Danielle Schmidt

Danielle has been in the dental field since 2013. She enjoys meeting and developing relationships with patients while helping them achieve their dream smile. In her free time, she enjoys shopping, traveling, spending time with family and friends, and playing with her dogs, Harley and Remi. One interesting fact about Danielle is most of her childhood pets were named after the Dukes of Hazzard characters.


Erica Hackett- Business Assistant
Erica Hackett

Erica has been in the dental field since 2014. She enjoys working with patients and helping them create the smile they want. She married her high school sweetheart, Pete, and they are expecting their first child, Kennedy. Erica is a huge Cardinals fan and she really likes to go to games. She enjoys spending time with her family and friends and she loves to be outdoors at her family farm. She is a huge dog lover and has Boxer named Brynley. One interesting fact about Erica is that she has been skydiving.


Kathy Schellhardt - Business Assistant
Kathy Schellhardt

Kathy has been in the dental field since 2014. She enjoys welcoming new patients into the office and working with them to answer any questions or concerns as well as assist them in finding the perfect date and time to meet their needs. In her free time she enjoys time with her husband and three children, taking weekend road trips, and trying new coffee shops! One interesting fact is that Kathy and her husband first met when they were 5 & 8 years old in the children’s class that her parents taught at church.



Jenna Purcell

Jenna is a graduate of the Lewis and Clark Dental Hygiene Program and has been in the dental field since 2009. The best part of her job is being able to help patients feel confident about their smile! During down time you can find her spending time with her husband and 3 sons. She takes pleasure in capturing photos of her family and posting to her blog to share with family and friends. One interesting fact about Jenna is that she comes from a town with a population of 700.

Nicole Korte

Nicky is a graduate of the Lewis and Clark Dental Hygiene Program and has been in the dental field since 2012. She appreciates developing a one on one relationship with patients, and being able to educate and motivate patient to retain or improve current oral health. Nicole spends her free time attending Cardinal games, boating with family and friends, playing with her dog Ella, and shopping. One interesting fact about Nicole is that she is afraid of fish!


Alyssa Courtoise

Alyssa is a graduate of the Lewis and Clark Dental Hygiene Program and has been in the dental field since 2014. She enjoys helping patients feel confident about their smile and building friendships along the way. She has 3 fur babies Mylo, Bella, and Jaxx. She enjoys dancing and is the assistant coach for the Civic Memorial dance team. She is recently engaged and enjoys camping, barbecuing, being outdoors and spending time with family. One interesting fact about Alyssa is she has won over 10 state dance titles combined as coach and dancer.


Dental Assistants


Dominique Clemons

Dominique is a graduate from Missouri College and has been in the dental field since 2007. Dominique likes making patients feel comfortable and working with children. In her free time she reads romance novels, samples white wines, enjoys watching basketball games with her family and laughing! One interesting fact about Dominique is that she recently took up running and completed her first 5k in June 2012!


Lisa Hollenkamp

Lisa has been in the dental field since 2010. She loves working with great people and seeing patients who are at first embarrassed of their smile leave beaming with a confident smile after treatment. Lisa enjoys spending her free time outdoors with her significant other, family and friends. She spends the summer time camping, going to Cardinal games, and taking mini weekend getaways. One interesting fact about Lisa is all through high school she worked for a pizza place and learned how to spin dough in the air really fast!


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