About Us

With a passionate team and experienced doctors, Duo Orthodontics knows how to create beautiful smiles. Alongside the orthodontic work, Duo also knows how to develop meaningful relationships with our patients. We emphasize communication and transparency—ensuring that you’re always informed every step of the way. When you and your family come into our office, you become part of our family.

Our doctors

Gordon Barfield DDS

Dr. Barfield finds great joy in his work as an orthodontist. He is able to bring about lasting changes in the lives of his patients, by working with them to develop smiles that improve their self-confidence in every aspect of their life. His profession allows him to develop one-on-one relationships with each patient, getting to know them as individuals with lives that extend far beyond the treatment chair.

His work brings him passion, accomplishment, and fulfillment. Dr. Barfield is always furthering his education by attending conferences and seminars. Keeping up to date with latest orthodontic developments ensures that his orthodontic work is modern and effective.

When not at the office, Dr. Barfield enjoys travelling, cycling, and scuba diving. He’s a die-hard fan of the North Carolina Tar Heels, and is proud to serve on the Clinical Review Panel for the “Smiles Change Lives” Foundation.


Education and Professional

Doctor of Dental Surgery, University of North Carolina, 1990

Certification in Orthodontics and Dentofacial Orthopedics, University of Nevada, 2009

American Association of Orthodontists

American Dental Association

Georgia Association of Orthodontists

Georgia Dental Association — Northern and Central District Dental Societies

Hinman Dental Society

Maria Lewis DMD

Dr. Lewis has a passion for orthodontics, and believes in helping patients from all cultures obtain the smile of their dreams. She believes that maintaining strong community relationships is the key to effective communication and true transformation.

Dr. Lewis was born and raised in central Brazil, where she obtained her first professional dental degree. After relocating to the United States, she obtained her American DMD degree, while beginning her practice. She has studied at the Mondelli Institute for Advanced Orthodontics, at Bauru University.

In her spare time, she is actively involved in outreach activities in her Latin community. Dr. Lewis has a dedication to philanthropic service that resonates with thousands in the dental and orthodontic communities here in Georgia and in Florida—as well as in her former home, Brazil.


Education and Professional

University of Uberaba, Brazil

DMD at Nova Southeastern University, Florida

Mondelli Institute for Advanced Orthodontics at Bauru University, Sao Paulo, Brazil

Our staff

Rachael Jones: Treatment Coordinator

Rachael is our bilingual treatment coordinator who maintains our welcoming environment for new patients and coordinates your early visits with us. Rachael helps our new patients as they move from “guest” to part of our patient family. She enjoys reaching out and being involved in community and educational events as well as being committed to welcoming new patients when they arrive in our office and strives to maintain lasting friendships with the whole family. Rachael loves working with Dr. Barfield and Dr. Lewis because they are energetic and passionate about creating great smiles. Outside the office, Rachael spends time with her three girls, Jada, Natalia and Ava. She also enjoys crafting, making jewelry and being involved with her kids’ sports and activities.

Erica Ventura: Orthodontic Technician

Erica is the youngest of six in her family. She has a young son named Aaron. In her free time she enjoys hanging out with her huge immediate and extended family, shopping, and playing soccer. Ericas passion for orthodontics stems from the strong family relationship background she has….and she describes building relationships with her patients and families as “growing my extended family”! Her favorite part of her job is helping young patients grow in confidence and maturity.

Tammie Croom: Treatment Coordinator

Tammie joined the team in 2013 after moving to the area from Southwestern VA, and has over 25 years experience in the orthodontic field. She enjoys watching the positive changes orthodontic treatment makes in growing young people as well as adults. She and her husband David live in Covington.  She has two daughters, a step-son, step- daughter, 5 grandchildren and 3 step-grandchildren! Tammie enjoys writing, singing, organic gardening, and exploring the off-beaten path with her camera.

Yasmin Faria: Financial and Insurance Coordinator

Yasmin is our financial and insurance coordinator as well as serving as a clinical orthodontic assistant. Yasmin is one of three members of our team that speak three languages fluently! She is married to Danilo, and is currently awaiting her first child. When Yasmin is away from work she enjoys spending time with Danilo and their dog, cooking, and watching the latest movies. Yasmin is one of the first faces you are likely to see when you come to our office, and one of  the favorite parts of her day is meeting the new kids that come into the office!

Jamie Perez: Orthodontic Clinical Coordinator


Jamie is originally from New Jersey and has been involved in orthodontics since she was 15 years old in some capacity. She truly loves it more every day and feels the wonderful experiences and interpersonal relationships she forms enrich her life! “What I love most about orthodontics is meeting new people and building lasting relationships with them; our patients become our family and friends.” says Jamie. “I am still fascinated by how a person changes during treatment and love watching them blossom with confidence.”

Jamie has a daughter, Lia, who is the light of her life, and does volunteer work as well as enjoying music and dancing while away from her work.

Vivian Ortiz: Orthodontic Technician/Practice Relations Coordinator

Viv is originally from Brazil, but grew up right here in Tucker! She went to Lakeside High School. Viv ( also known as “Vivi”) loves spending time with her husband Corey and son Alexis. They enjoy hiking as a family and Vivi is a great cook, especially of south american dishes!

Vivis love and interest in orthodontics stems from her love of working with children and young adults while being able to put a smile on their faces!

Bia Franz: Administrative Assistant

Bia comes from a happy family of five. She is married to Sam and is one of our welcoming administrative staff. She believes a confident and happy smile can change a life, and is continually amazed at the positive changes that occur in peoples lives when undergoing orthodontic treatment. Bia loves international food and trying new restaurants, going to the movies, and inviting friends over to enjoy her cooking!

Heather White: Orthodontic Technician

Heather is a Georgia native and recently joined us after a lengthy career with a retiring orthodontist near her home. She is so proud of her three children, Braydi, Ayden, and Kye. In her spare time she enjoys practicing yoga. Heather loves practicing orthodontics because she loves watching patient progress from start to finish, and building lasting friendships with our patients.

Come see us!


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Duo Ortho Marietta

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