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Our Staff


Houston Office

Sheri Bruess


Sheri is our office manager and treatment coordinator. She has worked for Dr. Renger since 1981 and has worked as an orthodontic assistant and/or orthodontic administrator since 1969. You will find Sheri to be a very knowledgeable, friendly, and caring person who thoroughly enjoys taking care of each patient she meets; making it a priority to insure new patients feel welcomed into the practice. Sheri assists patients in starting their treatment, handles financial arrangements, and answers any questions patients have regarding their beginning appointments. She enjoys working for Dr. Renger and is very proud to be part of a team which assures every patient quality orthodontic care. In her spare time she enjoys animals, especially her three senior dogs, reading, and gardening.




Esmeralda (Izzy) Perez

Izzy is a registered orthodontic assistant who enjoys all aspects of orthodontic care.  She is a very friendly and caring person who enjoys meeting new people.  She loves being an orthodontic assistant and working with a great team.  She wants all patients to experience a beautiful smile in a fun and caring office that is all about service and quality orthodontic treatment.  Izzy has a 2 year old daughter, Aaliyah, and in her spare time she enjoys scrapbooking and reading.


Luz (Lucy) Aguilar

Lucy is a registered orthodontic assistant who assists Dr. Renger in all orthodontic procedures including wire changes, fitting of bands, and impressions.  She is soft spoken, compassionate, and takes great pride in her work.  She says one of the most rewarding aspects of the practice is witnessing the end result of Dr. Renger’s treatments.  In her free time Lucy likes to spend time with her friends and family.



Hallettsville Office


Charlotte Sitka


Charlotte, being the “veteran of the practice,” started working with Dr. Renger in 1976 as a chair-side assistant. Presently she serves as a receptionist and office manager. Charlotte is a kind, out-going person who enjoys meeting people and will help answer any questions regarding the initiation of orthodontic treatment. She says that Dr. Renger has given both of her daughters and two of her grandchildren beautiful smiles and she can recognize a “Renger smile” anywhere! Charlotte is married and is the mother of two daughters. She enjoys family time with her seven grandchildren, hunting, reading, and gardening. She looks forward to working with you and assisting Dr. Renger and his staff in providing you or your child with the perfect smile!


Verna Meinkowsky

Verna has worked for Dr. Renger since 1979. She is an excellent assistant who makes every patient feel comfortable and valued. She says she is honored to be an essential part of Dr. Renger’s team. As Verna frequently tells patients, three of her sons are the proud recepients of the “trademark Renger smile.” She adds: “Dr. Renger takes pride in each and every patient and gives everyone 110% of his efforts – and the results speak for themselves.” Verna enjoys spending time with her family which includes three grandchildren. She also appreciates music and finds enormous pleasure in outdoor activities, maintaining that her love of nature is an integral part of her life.


Brenda Sitka

Brenda is the girl who excels at keeping our office on track and on time. She is our “energizer bunny” – always in motion and willing to meet and greet patients with her warm and enthusiastic smile. Brenda has worked for Dr. Renger for over fifteen years, during which time she and her husband were busy raising four active boys (ages 10 to 20). Brenda was in fact one of our patients, as were three of her sons. Brenda is wise, trustworthy, and competent. She is definitely an invaluable asset to Dr. Renger’s practice. In her spare time, Brenda likes to fish, shop for antiques, and travel; involves herself in various community activities, and takes pride in being a devoted wife and mother.