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Meet Our Team of Arlington Heights Dental Experts

Team at Costello & DeHart Dental Excellence posing and smiling

Office Manager and Front Office Team Leader Liz Liz, Office Manager and Treatment & Financial Coordinator

Liz has had a well-established career in dentistry, beginning with chairside assisting while working on her teaching degree at NEIU in Chicago. Her career has evolved over a 40-year span. Liz is our Office Manager and Treatment & Financial Coordinator and has been with our dental office for over 20 years. She is easily recognized by her cheerful voice and pleasant smile. Most of our patients look to Liz to accommodate all their scheduling and treatment planning needs. She enjoys biking, traveling, reading, watching movies, visiting the botanical gardens, studying French and taking online courses. She is fluent in Polish and hopes to travel there one day. Spending time with the loves of her life, Tyler and Jake takes precedence overall.

Georgia, Insurance Coordinator Georgia, Insurance Coordinator

Georgia’s career in dentistry covers over 40 years and counting! She studied at both Triton Junior College and Elgin Community College, earning her Associates in Administrative Assisting. Today, she loves being able to smoothly assist patients with all of their dental insurance-related concerns and questions. Originally from the Chicago area, she has been blessed with two amazing sons. In her spare time, you can usually find her hanging out with her family, traveling, being near water, boating, listening to music, and dancing. She also always enjoys making other people laugh.

Dental Assistant TerriTerri, Front Desk Coordinator

Originally from Wheeling, Terri has been in the dental arena for over 40 years! After completing the dental assistant program at Loyola, she worked in the position for 25 years, 15 of which were spent alongside Dr. Trumfio. She loves forming long-lasting relationships with patients and being an integral part of the dental office team. Her passion for helping others always shines through. In her free time, she enjoys volunteering at various local ministries, lounging with her expanding family at their Wisconsin lake house, boating and gardening.

Dental Hygiene Team Leader Anne Marie Anne Marie, Dental Hygiene Team Leader

Anne Marie began her affiliation with Dr. John Costello as a high school sophomore working part-time as a Dental Assistant. Her interest in dentistry led her to Dental Hygiene school where she completed all coursework at Harper College and now presents to our patients the experience of a 30-year career in Dental Hygiene. She is the Director of Hygiene Care and Periodontal Instruction in our dental office as well as our Dental Hygiene Team Leader. She is certified in local anesthesia and nitrous oxide sedation. In this capacity, she is better equipped as a Dental Hygienist to provide professional services for even the most sensitive patient procedures. Anne Marie is a certified Auxiliary in the Invisalign tooth alignment system. She enjoys spending time with her family and friends. She also enjoys most of her time with her two year old daughter, Avery, the light of her life!  

Dental Hygienist Mary Mary, Dental Hygienist

Mary has been a Dental Hygienist for 30 years and still loves what she does on a daily basis. She states “It is so very rewarding helping patients and getting them motivated to care for their mouths, which then improves their general health.” Mary has also been certified through the Scheduling Institute in extraordinary telephone customer service. Originally from Lincoln Nebraska, she graduated from the University of Nebraska where “Yes, they really do know and love football!” She has been married for 15 years to her husband and best friend, Larry. They have two daughters. Emily is a Senior at the University of Nebraska and Katie is a Sophomore at the University of Nebraska. Mary loves to read and travel.

Dental Hygienist Carla Carla, Dental Hygienist

Carla is a Dental Hygienist and has been providing hygiene services for Costello & DeHart Dental Excellence for almost 10 years. She first came to our dental office as a patient.   She has over 20 years of dental hygiene experience, with a strong background in Periodontics and Implant Dentistry. Carla is certified in local anesthesia as well as nitrous oxide sedation, making her a very knowledgeable asset to our team. Most recently, Carla was certified through the Scheduling Institute in extraordinary telephone customer service. Her pleasant nature and extreme competence have been a wonderful enhancement to our full-time staff. She lives in Arlington Heights, with her husband and three children. She enjoys spending her time with family and friends.

Dental Hygienist Laura Laura, Dental Hygienist

Laura is a Dental Hygienist who began her dental career with Dr. John as an assistant back in 2006.  His enthusiasm and love of his work got Laura interested in learning more about the dental field.  After a few years of dental assisting, she went on to get her degree in Dental Hygiene and graduated from Harper College in 2010.  With her gentle touch and calm chair side manner, Laura provides exceptional care while making patients feel as comfortable as possible.  She is certified in both local anesthetic and most recently through the Scheduling Institute in extraordinary telephone customer service.  In her free time, she likes spending time with family, friends, and her dog, Jenna.  Laura is a huge Chicago Blackhawks and San Francisco Giants fan. During baseball season, you may overhear her giving Dr. John a hard time about the Chicago Cubs.

Dental Assisting Team Leader Margaret Margaret, Dental Assisting Team Leader

Margaret is one of our full-time dental assistants and is our Dental Assisting Team Leader. She has been affiliated with Dr. John Costello for over 18 years, serving as his chairside assistant. She is proficient in all phases of general and cosmetic dental assisting and also serves as the person responsible for the beautiful enhancements that result from her assistance in tooth whitening and shade selection. She has completed coursework to enable her to perform tooth polishing and sealants as a hygiene assistant and has been certified through the Scheduling Institute in extraordinary telephone customer service. Margaret is also bilingual, speaking fluent Polish, and brings her pleasantness to the workplace all the way from Lake Villa, Illinois.  Margaret is married to Peter and has twin daughters, Michelle and Paulina, who are in college. Her family plays a large role in her life. Margaret enjoys going on vacations with her family, especially to warm sunny places like Florida. In her free time, Margaret likes going to the health club to enjoy some Zumba and taking walks with her husband.

Dental Assistant Maddie Maddie, Dental Assistant

Maddie first joined the Costello & DeHart Dental Excellence team in May of 2018, and she already loves working with such wonderful patients and doctors who have a great deal of integrity. Originally from Glenview, she has a boyfriend, two cats, and two dogs. Her favorite hobbies outside of the dental office include jet skiing, off-roading, and riding her scooter around in the summer. She always has a smile on her face!


Dental Assistant Carly Carly, Dental Assistant

Carly is a dental assistant and has been with Costello & DeHart Dental Excellence since July of 2016.  She enjoys working with our patients and being part of a family-oriented dental office. An Arlington Heights native, Carly attended Wheeling High School and Harper College. Though Carly has been with the team for just a short while, she has been a part of some amazing cases. "Being a part of the case from day one, and seeing the end result months later is the most rewarding thing about my position." She loves her very outgoing, sarcastic family, and when she’s not working she enjoys spending time with the people she cares about and making the most of every moment with them. Carly likes to sing and dance in order to make everyone around her smile.

Front Desk Coordinator Danielle Danielle, Front Desk Coordinator

Danielle first joined our team in July of 2019, and she’s undergone plenty of in-house training already with plans to attend Harper College soon to pursue dental hygiene as a future avenue. As our dedicated front desk coordinator, she loves building such strong relationships with each patient who walks through the door. She’ll definitely try to make you laugh! At home, she has two boys named Isaiah and Kahne. In her free time away from the dental office, she enjoys hanging out with loved ones and watching her sons grow over the years.

Patient Coordinator Jackie Jackie, Patient Coordinator

Jackie completed her studies at the First Institute before joining the dental field 6+ years ago. In that time, she was both an orthodontic assistant and a treatment coordinator. Since joining our team, her favorite aspect of her job has been connecting with patients and bringing a smile to their faces.

Originally from Des Plaines, Jackie loves spending her time outside the office with her boyfriend and dog baby, Spook Bear. She also enjoys getting outdoors, being with friends and family, and eating good food!