Demko Smiles Staff

Trustworthy. Empathetic. Efficient. Invested.

At Demko Orthodontics, we want patients to feel at ease when they walk into our office. Our team is experienced, accessible and authentic, and they will take your treatment as seriously as you do.

Dr. Demko hand picks and cross trains her entire staff, resulting in an extremely informed, well-versed, and capable team that can address all patient needs and questions. Because of their talent, passion, and synergy, the Demko team is ready and able to handle all orthodontics issues, no matter how challenging they may be.

Chesterfield Location

Holly Klaesner

Holly Klaesner

Treatment Coordinator

Since 2005, Holly has been helping patients achieve beautiful smiles, and she has loved every minute of it. As a treatment coordinator, she assists Dr. Demko during new patients’ visits and walks them through the treatment process.

Holly is married with two girls and a dog.  Her family enjoys spending time together swimming, boating, and vacationing in Florida.

Heather Openlander

Heather Openlander

Office Manger

Since joining Demko Orthodontics in March of 2007, Heather has devoted herself in making the Demko Orthodontic experience for every patient the best it can be.  Having been in the orthodontic field since January 0f 2004, she knows what is important to the patient and will work to have those needs met.

Heather enjoys life away from work, as well.  Whether it’s her annual trips to Walt Disney World or relaxing with a good movie, she makes the most of her off-time.  She keeps herself busy with family commitments, her cat Walter and spending time with her husband Kirk.

Tory Behnen – Patient Coordinator

Tory has been bringing her son to Demko Orthodontics and has been very happy with the friendly and informed staff.  She is excited to be working here so that she can get to know all of the great patients that Dr. Demko has, and be here to help them every step of the way.

Tory has one son, Devin, 13, who keeps her very busy.  He enjoys playing hockey and soccer. She also loves to spend time with her family and friends, and two dogs Molly and Lionel.

St. Charles Location

Donna Moore

Donna Moore

Treatment Coordinator

Donna has been with Demko Orthodontics since January 2003 and has been in orthodontics for the past 25 yrs. Donna enjoys working with Dr. Demko to help create beautiful smiles.

In her free time, Donna loves spending time with family,friends, shopping, and reading a book.

Debbie Skelton

Debbie Skelton

Lab Technician/ Clinical Assistant

Debbie has been with Demko Orthodontics since January 2003,

She has been in the dental field most of her working years and in the orthodontics for 25 years. She is a clinical assistant and a lab technician.

Debbie is married and loves to spend time with her family, most of all with the grand kids., she loves to work in the garden and for quiet time loves to sit and read a good book.

Nicole Heater – Patient Coordinator

Nicole HeaterNicole joined the Demko Orthodontics team in February of 2014, first as a clinical assistant and now as a patient coordinator in our St. Charles office.

Nicole loves working at Demko, because she gets to interact with amazing patients whose smile always light up a room.

Nicole loves spending her time with her husband Joel and their two sons Max & Isaac. She also enjoys playing volleyball and watching Blues hockey.

Washington Location

Kim Dowil

Kim Dowil

Insurance Coordinator

As Financial Coordinator in our Washington office, Kim is now working behind the scenes more & coordinates the insurance for all 3 locations. She has 21 years experience in the field of orthodontics.  

Kim has been with Demko Orthodontics since 1995, taking a 2 year break to focus on her family and rejoined our office in 2002. Kim and her husband enjoy boating, camping, and being outdoors with their 2 boys.

While she is no longer working with the patients on a one to one basis she is still rewarded to know that the patients are growing confident & are happy because of the beautiful smiles that Demko Orthodontics is helping to create.

Kerry DeJesus

Kerry DeJesusKerry has worked for Dr. Demko for more than eleven years. She started out as clinical assistant, then patient coordinator for the Washington location, now works part time helping out wherever she can. She enjoys getting to know the patients and families of the practice. She says she loves watching the kids of the practice grow up.

Kerry and her husband, Mike are the proud parents of a 7 yr old son, Seth and twin 3 yr. old boys, Colin and Caden. She works hard to keep her sanity by getting out of the house and coming into the office for a “break”. In her spare time, she enjoys just spending time and goofing off  and spending time with her family.  She recently moved into a fixer upper and has fixing up the house with her husband and sons. She tries to sneak in a little pink here and there to break up all the blue due to being outnumbered by all the boys in her house. 

Sydni Gaddy – Patient Coordinator

Sydni GaddySydni joined the Demko Orthodontics team in July of 2014. As the Patient Coordinator in our Washington office, Sydni is always happy to assist our patients with any questions they have or needs that must be met.

When not watching her daughter Kaitlyn play soccer with her fiance Nick as coach, Sydni also enjoys crocheting, crafting and playing with her family’s German Shepherd Sam, and cat Kennedy.

Cate O’Brien – Treatment Coordinator

Cate ObrienCate joined Demko Orthodontics in June of 2015.  She grew up spending time in her father’s dental office learning the importance of providing a healthy smile.  As a Treatment Coordinator she is devoted to making every new patient feel welcome and informed during the treatment process.

In her spare time Cate enjoys spending time with her fiance Darren and her future step children Cody and Sabrina fishing, hiking, swimming, and exploring the Katy trail.

Clinical Team

Katy Atkins

Katy AtkinsKaty is a certified dental assistant and has worked with us since November 2002.   She loves the work she does and loves the impact that it will no doubt have on the patients for years to come.

In Katy’s free time she loves spending time with her ever growing family and her 4 legged fur babies Lacy, Gunnar, Cooper, and Luna.  She also loves to cheer on her beloved Chicago BLACKHAWKS and CUBS, as well as enjoys watching a good college basketball or football game with her hubby, friends and family.

Brea Ramsey

BreaBrea’s favorite thing about working at Demko is working on all of the wonderful patients and helping give them their perfect smile.  Brea loves spending her time off with her puppies , Rue and Raven, as will as spending time with her lovely husband Ross. Her and her husband love going on trips and competing at local crossfit competitions.

Amy England

Amy EnglandAmy is a registered dental assistant who graduated from Forest Park Community College in the summer of 2008.  Since the birth of her son, Aiden, she has taken on a part time role with Demko Orthodontics.  We love our Amy and she will always be part of our Demko family no matter where life takes her.


JoAnn Hirt

JoAnn HirtJoAnn is a certified dental assistant and has been in the orthodontic field for 20 years.  She is also a lab technician and makes retainers. Even has her own small lab business.

She enjoys seeing the patients progress on their way to a beautiful smile while working in a friendly and positive atmosphere.

JoAnn has been married for 36 years and has 3 wonderful children and 4 grandkids. Loves spending time with family and friends. She is involved in her church , likes to travel, garden and works on craft projects.