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.
Shannon Hann
Registered Dental Assistant
Shannon Hann is a Registered Dental Assistant at Tri-Cities Center for Cosmetic Dentistry. A longtime resident of Kingsport, Tennessee, she graduated from Dobyns-Bennett High School. After spending some time living in Georgia with her husband early in their marriage, Shannon and her family returned to Kingsport to settle down and raise their children.
Shannon’s passion for dentistry stems from her love of helping others feel confident in themselves. She believes that a smile is one of the first things people notice, and being part of creating beautiful, healthy smiles is deeply rewarding to her. For Shannon, seeing a patient leave the office smiling proudly is the best part of her day.
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Outside of work, Shannon enjoys life as a wife and proud mother of two young men. Her family are avid NFL and MLB fans, often traveling to Atlanta to cheer on the Falcons and Braves. She loves music, concerts, and festivals, as well as spending time outdoors kayaking, hiking, and soaking up the sunshine. When relaxing at home, Shannon enjoys painting, reading, and curling up on the couch with her boys for a good movie.
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.
Chloe Morrison
Registered Dental Assistant
Chloe Morrison is a Registered Dental Assistant at Tri-Cities Center for Cosmetic Dentistry. Originally from Murfreesboro, Tennessee, Chloe graduated from Rockvale High School in 2023 before completing her Dental Assistant program at the Tennessee Professional Training Institute in July 2025, where she also earned her Radiology certification. She began her college journey at Milligan University, where she played soccer for two years, and is now a junior at East Tennessee State University (ETSU) finishing her degree and preparing to apply to the Dental Hygiene Program.
Chloe’s passion for dentistry was sparked during her first mission trip to Honduras. Having experienced dental challenges herself, she developed a deep desire to help others—especially those without access to proper dental care. That experience solidified her calling to serve others through dentistry and inspired her to pursue a long-term career in the field. Her favorite part of the profession is witnessing the joy and confidence that patients gain after receiving the dental care they need.
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Chloe knew she was in the right profession when she returned from that mission trip, having helped countless individuals who were deeply grateful for her care. The smiles, hugs, and heartfelt appreciation she received affirmed her purpose and inspired her to continue combining her love for dentistry with her passion for helping others, both locally and abroad.
Outside of work, Chloe enjoys staying active and spending time outdoors. She loves playing soccer, volleyball, and pickleball, as well as hiking and hanging out with friends. A proud dog mom to two Aussie Doodles, she enjoys life on the go and cherishes time with her family of six—including her two sisters and brother.
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.