Meet Our Staff


We 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.


H. Scott Osborne, PA-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.


Rachel Smith, PA-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.

Kim Calderon

Kim Calderon, RN, FNP-C

Kim completed her undergraduate degrees at Tyler Junior College and The University of Texas at Arlington. She practiced as a registered nurse in the Marshall/Longview area for 10 years before graduating as a nurse practitioner. Kim completed her graduate studies at The University of South Alabama and is board certified as both a family nurse practitioner and adult acute care nurse practitioner.

She is originally from Marshall, TX and is excited to provide dermatology services to those is her community and surrounding areas.

Kim is married to Jerry, and has two children, Maddie and Carter. She and her family enjoy traveling and spending time with friends.


Tammi Short, RN, FNP-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.


Lainey Seahorn – Aesthetician

Wallis Dermatology is proud to be the only dermatology clinic in Longview to have a licensed Aesthetician on staff ; come by and meet Lainey Seahorn! Born and raised in Allen, Texas, Lainey is also a 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.


Misty Sprouse – Chief Financial Officer

Misty Sprouse joined Wallis Dermatology Associates in 2019, bringing over 18 years of healthcare management experience to the practice. Misty earned a Bachelor of Business Administration, Accounting in 1999 and obtained her Certified Public Accountant certification in 2004. During her time in healthcare, she has held various positions in accounting, human resources and practice management.

Misty is a native of East Texas and is married with two wonderful children. She enjoys spending time with her family doing church activities, camping, boating and various sporting events.


Pam Chain-Fudge – Office Manager, Doctor Circle

Pam Chain-Fudge 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 10 years’ experience as a CMA and over 25 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.


Elizabeth Bowen – Office Manager, Marshall

Elizabeth Bowen has several years experience as a Medical Assistant and is the Office Manager in our Marshall location. 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 happily married to Doug and together have 4 children. They are actively involved in
church and enjoy traveling and family time.