At The Tri-Cities Center for Cosmetic Dentistry, you’ll find a team committed to the provision of excellence. From the gracious hospitality of Southern charm to an unwavering commitment to exceptional quality, an encounter within our care will be one you are sure to remember.
Meet Our Team
Leigh Bergemann
New Patient and Complex Case Coordinator
Leigh Bergemann serves as the New Patient and Complex Case Coordinator at Tri Cities Center for Cosmetic Dentistry, where she brings a unique blend of business acumen, personal experience, and heartfelt compassion to every patient interaction.
Leigh holds a B.S. in Business Management from Meredith College in Raleigh, North Carolina. Her diverse professional background includes years of experience across the U.S. and abroad during her time as a military spouse. Eventually, she settled in the Tri-Cities area to raise her sons near her parents. Long before joining the team, Leigh was a patient of Dr. Sanders and experienced firsthand the life-changing impact of a smile transformation. Inspired by the team’s attention to detail and patient comfort, she knew she wanted to be part of something so special.
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Her business and marketing background proved to be a natural fit for the practice, and over time, she earned the trust of dental professionals and patients alike. One pivotal moment came when fellow professionals began relying on Leigh for case details without needing to speak directly with Dr. Sanders—solidifying her confidence that she had found the right role.
Outside of work, Leigh lives in Kingsport with her husband, Bob. She is a proud mother of three sons and equally proud mother-in-law to their wives. Her greatest joy is her growing family, which includes five grandchildren—Lochlan, Leyton, Lewis, Owen, and Mackenzie—as well as three cherished step-grandchildren: Alexis, Nathan, and Keira. In her free time, Leigh enjoys reading, traveling, and staying active in her church, Holy Trinity Lutheran, where she sings in the choir and volunteers with the Sunday Meals on Wheels program.
Gretchen Witt
Dental Hygienist
Gretchen Witt has been a dedicated Dental Hygienist at Tri Cities Center for Cosmetic Dentistry since February 2017. A lifelong Tennessee resident, Gretchen holds a Bachelor of Science in Organizational Management from Tusculum College and a Bachelor of Science in Dental Hygiene from East Tennessee State University.
Becoming a dental hygienist had always been a dream of hers, and after raising her three children, she returned to school to make that dream a reality. From her very first day on the job, Gretchen knew she had found her true calling. Her favorite part of the profession is building meaningful relationships with her patients—many of whom have become close friends. She finds immense joy in helping people improve their oral health, educating them about the connection between a healthy mouth and overall systemic health.
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Gretchen is committed to continual learning, regularly completing continuing education courses and actively participating in several online dental communities to stay current in her field.
Outside the office, Gretchen is a proud mother of three and a hands-on “Gigi” to eight beloved grandchildren. She cherishes every moment spent with her family and also enjoys golfing, traveling, and spending time with her circle of close friends. Her warmth, passion for healthcare, and genuine love for people make her an invaluable part of the Tri Cities team.
Rachel Napier
Registered Dental Assistant
Rachel Napier has been a valued Registered Dental Assistant at Tri Cities Center for Cosmetic Dentistry since 2020. Originally from New Jersey, Rachel made her way to the Adirondack Mountains before eventually settling in Johnson City in 2016—and she hasn’t looked back since.
Rachel’s path to dentistry began when she discovered a career that not only allowed her to help people, but also provided a balanced schedule with weekends and holidays off. What started as a practical choice quickly became a passion. Her favorite part of the job is watching patients transform—from hiding their smiles to radiating confidence.
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She knew she had found her calling the very first time she assisted with a procedure. Witnessing a patient go from pain to relief sparked a deep sense of purpose that continues to drive her every day.
Outside of the dental office, Rachel is a proud mother of two daughters who are the center of her world. She’s a creative spirit who enjoys painting, learning new languages, and diving into obscure trivia—anything to stay curious and better connect with her patients. And when it comes to cats, Rachel is a proud enthusiast. Her warmth, humor, and compassion shine through in both her professional care and personal connections.
Rebecca Berg
Registered Dental Assistant
Rebecca Berg is a skilled Registered Dental Assistant who has been a valued part of the Tri Cities Center for Cosmetic Dentistry team since January 2023. A proud Tri Cities native, Rebecca completed her dental assistant training at Eastern College of Health Vocations in Louisiana in 2010 before returning home to build her career.
Rebecca has a deep passion for helping people regain their confidence through improved dental health. She takes pride in being part of a team that transforms smiles and changes lives. For her, the moment she knew she had found her calling was when she realized the positive impact she had on a patient’s comfort and experience during treatment.
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Outside of the office, Rebecca is an avid hiker who loves nothing more than hitting the trails. Whether exploring new paths or revisiting old favorites, she finds joy and peace in nature. She’s active in the local hiking community and recently helped found a women’s hiking group in the Tri Cities area, combining her love of the outdoors with her passion for connecting with others.
Laurie Lucas
Registered Dental Assistant
Laurie Lucas brings decades of experience, compassion, and skill to her role as a Registered Dental Assistant at Tri Cities Center for Cosmetic Dentistry. She earned her dental certifications—including radiology, coronal polishing, and sealants—from the University of Florida. In 2021, Laurie relocated to East Tennessee to be closer to one of her sons and his family, quickly falling in love with the region and its natural beauty.
Laurie’s passion for dentistry began right after high school, inspired by the positive experiences she had with her childhood dentist. From her very first day assisting chairside, she knew she had found her professional home. What she loves most is helping recreate beautiful smiles with crowns or veneers—seeing the joy and confidence on a patient’s face is, to her, the most rewarding part of the job.
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Outside of work, Laurie is a devoted wife, proud mother of three grown children, and loving grandmother to four grandchildren. She enjoys gardening, reading, and exploring thrift shops for hidden treasures. She and her husband have also spent countless hours driving around East Tennessee, taking in the scenery and enjoying everything their new home has to offer. Laurie’s warmth, dedication, and eye for detail make her a cherished member of the Tri Cities team.
Keli McDowell
Scheduling Coordinator
Keli McDowell is the friendly and efficient Scheduling Coordinator at Tri Cities Center for Cosmetic Dentistry, where she has been helping patients manage their care since 2025. Originally from a small town in Utah, Keli’s journey brought her to Tennessee after her husband accepted a job in North Carolina—eventually settling in the Tri-Cities area.
Keli began her career in the dental field in 2016 and quickly discovered a passion for the fast-paced, ever-evolving nature of the industry. She thrives on learning something new every day and takes great pride in helping patients get the care they need. Her love for people and warm personality shine through in every interaction, making patients feel welcomed and cared for from the moment they walk through the door.
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Keli knew she had found her calling when she began witnessing the life-changing impact a new smile could have on someone’s confidence and well-being.
Outside of the office, Keli and her husband stay busy with their five children and four grandchildren—with one more grandbaby on the way! They love traveling to spend time with their growing family and enjoy outdoor adventures like camping, hiking, and cruising together whenever they can.