Our Team

Mary Mueller – Office Manager

Mary started working with Dr. John as his Dental Assistant when he bought the practice in 1998. Through the years, she has advanced into the role of Office Manager.

“I love being able to use my skills and talents to help people. I enjoy getting to know our patients and allow them to get to know me. This process helps to develop a trust and a relationship between us. I really like the opportunity to get to know so many different people. It really gives me a sense of accomplishment to be able to help someone.”

What do you like best about working in the dental office? “Working outside my home gives me a chance to interact with different people. The added income allows my family extra opportunities we may not be able to have if I was a stay at home Mom. I also like being a part of a great team.”

What do you like most about Dr. John? “He really truly values the opinion of all of us. He gives us the freedom to be able to work independently and solve our own problems. He really trusts all of us and is a member of our team.”

What do you like to do when you are not at work? “I have two young children who keep me very busy! I am fortunate to be able to work part-time 4 days a week, which gives me a lot of time to be able to spend with my family and volunteering at our kids’ school. My husband and I enjoy gardening and we try to get away camping with the family whenever we get a chance. We also spend a lot of time with our family and friends, there is never a quiet moment around our house – we are always busy doing something.”

Favorite Patient Story: “I really enjoy seeing patients “transform” in our practice. Several years ago, a single woman in her early 30’s had not been to the dentist in many years. She was very scared due to some bad experiences in the past. During her interview with Dr. John, she got very emotional about being there and was crying. She was one of the most nervous patients I had ever seen in our office. After many years and talking her through a significant amount of dentistry, she is now choosing to have dentistry done, asking “when can we do the next step?” She moved to IL and now drives several hours to come see us. Seeing how far she has come really is impressive.”


Gina Winkler – Dental Hygienist

She has been working with us for 15 years and a hygienist for 18 years.

“I love my career and our office. I like the interaction I have with our patients, the ability I have to help people, and the reward I get when I see people change their habits and work towards health.”

What do you like most about your coworkers: “They are great! They are willing to help when needed and we are a team. They are also my friends.”

What do you like best about hygiene? “It’s rewarding and challenging. I am not a person to sit at home, I need interaction with people. I know as a hygienist I can make a difference in my patient’s health, and I like that.”

What do you like best about Dr. John? “He is a very nice and patient person. He cares about his team and his patients. He is always looking for new ways to improve our practice and help our patients move towards health.”

What do you like to do when not at work? “We have a cottage and I enjoy relaxing there. I love downhill skiing and spending time with my family. I like to experiment with different recipes and try to make them as healthy as possible. I enjoy working out, and I just started taking yoga classes.”

Gina’s favorite patient story! “We have a patient that I struggled with because she would come in time after time and have heavy plaque and food debris each time. It got frustrating and I was ready to give up. We got a new technology at work that measures plaque and her eyes and ears were opened and she responded well. My frustration turned to feeling like I finally broke through whatever barrier that I had with her. This was rewarding. I think we have a great office to work in, I am fortunate to work with such wonderful people. Our technology is top of the line and very helpful when trying to move our patients toward health.  We have a lot of tools to work with that makes my job easier. We all work very well together.”


Becky Kraus – Dental Assistant

She is one of our Dental Health Coach team members. She has been working with us since 2013 and has been working as a dental assistant since 2006.

“I like working with Dr. John because he takes time with each patient. He genuinely wants to get to know and understand each patient. He possesses patience and is a wonderful dentist. Dr. Korolewski is always teaching the staff new things and enjoys our involvement in the process along the way.”

What do you like best about your co-workers? “I enjoy how very friendly, outgoing, and knowledgeable everyone on our team is. Everyone is a team player, we work together to get the job done.”

What do you like about dental assisting? “I love helping our patients by transforming their smiles, assisting them to improve their health, and educating patients on good oral health. I really like the patient interaction and getting to know each individual.”

What do you like best about Dr. John? “He is always open to discuss anything. Dr. Korolewski is a great dentist and the patients and staff really enjoy him. He is always learning and wants to do the best for his patients.”

What do you like to do when you are not at work? “I am married to the love of my life and my best friend and together we have two boys. I enjoy playing outside with my kids and going for walks. I also cherish spending time with my family. Other things I like to do include: watching movies, cleaning, deer hunting, and shopping.”


Nikki White – Dental Assistant

Nikki is a Dental Assistant here at the Dental Health Coach. She is originally from North Carolina and has been a Dental Assistant in many different states throughout the country since 2008 while traveling with her husband in his career in the Coast Guard.

“I love being able to interact with all the different patients I get to meet on a day-to-day basis. I love the versatility of being a Dental Assistant and always seeing new and exciting procedures that aid people to achieve their dental health goals.”

What do you like most about Dr. John?  “He is very patient and kind. He is always willing to teach – both his team members and his patients.”

What do you like to do when you are not at work? “I have two children who keep my husband and I very busy. With a pre-teen daughter and young son who are very active in sports, we don’t get very much down time. Both of our families are out-of-state, and we enjoy traveling home to visit them whenever we get the opportunity.”


Sally Simon – Dental Hygienist


Heather Ardston – Administrative Assistant

New to our team but bringing more than 30 years of experience in Dentistry.

“I love dentistry because of the people. I love to build relationships with patients, and help them with any questions or needs they may have.”

What do you like most about your co-workers? “They have truly welcomed me to their team and go out of their way to assist me with anything I may need. They are the true definition of team players. They are also fun and kind.”

What do you like most about Dr. John? “He cares for his patients immensely. He will take all the time necessary to provide the patient with all their options and information they may need to get to where they need to be for their specific circumstances. I feel this sets him apart from the rest.”

What do you like to do when you are not at work? “Spend time with my significant other, my sister, many friends, and my dogs. I enjoy travel, live music, and volunteering with dog rescue organizations. I recently bought a new home and have been busy renovating and updating many areas little by little, and am very lucky to have a handy partner who is a jack of all trades.”

Favorite Patient Story: “Every day there is a new one. Whether it’s a story of how our dentistry transformed them, or how coming to our practice feels like visiting family. I also love their personal stories of amazing places they have traveled, as well accomplishments they or their children may have achieved.”