Meet Our Staff

IMG_6014-EditWe are especially interested in making all our patients feel right at home! We put your needs first to achieve efficient and comprehensive treatment and have sincere concern for our patients’ well-being. Our staff is trained and skilled, and we strive to provide professional service to each patient. Our team has years of dermatology experience in treating patients with the highest level of care. We strive to stay abreast of the very latest in technology and advances by regularly attending continuing education courses from the Dermatology Nurses Association (DNA) and annual DNA meetings in association with the American Academy of Dermatology.


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H. Scott Osborne, P.A.-C.

H. Scott Osborne, PA-C, has been in the medical field for 30 plus years. He has been in practice with Dr. Mark S. Wallis, since 2001. Prior to that, he practiced in family medicine in Longview.

Scott spent 20 years in the United States Air Force, stationed in Texas, California, Florida, Alabama, Belgium and Crete. His career in the USAF included 12 years as an emergency room medic and supervisor and 8 years as a Family Practice physician assistant.

Mr. Osborne graduated from high school in Hampton, Virginia, and graduated from the University of Nebraska with a bachelor’s degree in 1992 and his master’s degree in 1999.

Scott has two sons, David and Joshua; a daughter-in-law, Alex; and a grandson, Tyler.


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Tammi Short, R.N., F.N.P.-C.,

Tammi Short, RN, FNP-C, is a Nurse Practitioner at Wallis Dermatology Associates. She has been in practice since 2002. She is happy to assist you with your medical and cosmetic skin care needs. Tammi began her undergraduate college education at The University of Texas at Austin, where she graduated in 1994 with a Bachelor of Science in Nursing. She then worked at MD Anderson Cancer Center in Houston as Certified Wound, Ostomy and Continence Nurse in 1996. Mrs. Short went on to earn her Master of Science in Nursing at Texas Tech University Health Sciences Center in 2002.

Mrs. Short’s dermatologic interests include acne and psoriasis treatment, sclerotherapy for leg vein treatment, photodynamic therapy, Botox/Dysport, and cosmetic fillers.

Tammi is an active member of Texas Nurse Practitioners (TNP) and the American Nurses Association (ANA). She volunteers with St. Mary’s Catholic Church in Longview with the Faith Enrichment Program.

Her hobbies are singing and collecting Coca-Cola memorabilia. Tammi is married to Ron, and they have three children.


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Rachel Smith, P.A.-C.

Rachel Smith, PA-C has been a practicing Physician Assistant since 2003. She practiced General Medicine from 2003-2006 in Mission, Texas and from 2007-2011 she practiced locally in the field of Rheumatology. Rachel joined Wallis Dermatology Associates in the Fall 2011. She is honored to be able to help meet Longview’s general dermatologic needs.

Rachel spent most of her childhood in Slovakia, where her family was involved in Missionary work. She graduated Cum Laude from the University of Texas Pan American with a Bachelor of Science in 2003.

Rachel feels her most honorable achievement is being the mother of two beautiful little girls, Jaquelyn and Mia Claire. She enjoys running, shopping, traveling and being with her family.


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Charity Burkhardt, P.A.-C.

Charity Burkhardt P.A.-C. was born and raised near Dallas, Texas. She graduated from Dallas Baptist University with her bachelor’s degree in Science. She continued her studies at the University of Texas Heath Science Center where she received her Master’s of Physician Assistant Studies.

Charity worked in family medicine before joining Wallis Dermatology Associates in January 2014. She is looking foward to serving your dermatologic needs while working in collaboration with our skilled physicians.

In her spare time, she enjoys traveling the world, participating in her local church body, cooking, and exploring the beautiful outdoors. Her most treasured moments are spent with her husband Justin.


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Lainey Seahorn – Aesthetician

Wallis Dermatology is proud to welcome our newest team member, Lainey Seahorn! Born and raised in Allen, Texas, Lainey is a Medical Aesthetician and Certified Laser Technician. She attended Ogle School of Hair, Skin & Nails in Dallas, TX and Texas Laser and Aesthetics Training Academy in Austin, TX. Lainey strives to make people look and feel their best. She has taken additional training courses for dermaplaning, microneedling, chemical peels, and facial massage. In addition, she specializes in high quality facial and skin care treatments and IPL treatments.
Lainey is the proud mother of two children, Preslie and Cason. She enjoys the outdoors, shopping, and spending time with family.


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Brandy Lewis – Chief Financial Officer

Brandy Lewis joined Wallis Dermatology Associates in 2016, bringing over 16 years of accounting experience to the practice. Brandy earned a Bachelor of Business Administration, Accounting in 2001 and a Master of Business Administration in 2015. She has a diverse career background, having dedicated equal time to public accounting, the private corporate sector, and the healthcare industry.

Brandy is a native of East Texas and feels her most noteworthy accomplishment in life is earning the title of “Mom” to three amazing children. She enjoys cardio and weight training, traveling, and quality family time.


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Pam Chain – Office Manager, Doctor Circle

Pam Chain has worked for Wallis Dermatology Associates since 2002. Pam has 18 years of administrative office experience. She is married and has three children. Outside of work, she loves being a wife and mom and spending time with her family. Some of her hobbies include shopping and traveling.


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Tamron Thompson – Office Manager, Sixth St.

Tamron Thompson joined Wallis Dermatology Associates in 2008 as a Certified Medical Assistant. Tamron has 9 years’ experience as a CMA and over 20 years of administrative office experience.

Tamron enjoys traveling and playing golf with her husband, Steve, as well as spending time with their children and family.


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Elizabeth Robinson – Office Manager, Tyler

Elizabeth Robinson has several years experience as a Medical Assistant and has been office manager in the Wallis Dermatology Tyler office since 2014. She is happy to help make your visits to our clinic as pleasant as possible, and always offers service with a smile to all our patients.

Elizabeth is a proud United States Marine Mom to Chase and has a beautiful teenage daughter, Sara. She and her children are actively involved in church and enjoy spending family time together.