Providing elite, personalized, and professional care since 1977.

Our family-owned practice cares for patients of all ages, from all over Wyoming, Western Nebraska, and Northern Colorado.

About Us

For more than four decades, we’ve welcomed families from the beautiful areas of Cheyenne, Wellington, Laramie, Wheatland, Torrington, Douglas, Rawlins, and Saratoga, WY, as well as Western Nebraska and Northern Colorado.

Between our three clinic locations—Cheyenne, Torrington, and Wellington, CO—we offer a wide variety of medical and cosmetic dermatology services, serving patients and families of all ages.

As our patient, you can expect:

    • Professional, compassionate care from talented dermatologists, trained in techniques that produce the highest quality results
    • A family atmosphere cultivated by our caring, compassionate staff
    • Patient results; we determine the best treatment based on your desired outcome



Dr. Greg Seitz

Practices in our Cheyenne, Wellington, and Torrington clinics

Dr. Greg Seitz, a board-certified dermatologist and laser surgeon, brings a wealth of expertise and a passion for dermatology to his practice. With degrees in Zoology and Psychology from the University of Wyoming, Dr. Seitz pursued and earned his Doctor of Medicine in 2007 at Oregon Health and Science University. In 2011, he completed his specialty residency training at the University of Colorado, where he honed his skills in medical, surgical, and cosmetic dermatology, alongside dermatopathology and Mohs surgery.

Along with his commitment to his patients, Dr. Seitz has also worked as a teaching physician for the University of Wyoming Family Medicine Residency Program since 2011. Additionally, he is a member of the following esteemed medical associations:

  • American Academy of Dermatology
  • American Medical Association
  • American Society for Dermatologic Surgery
  • American Society for Mohs Surgery
  • Colorado Dermatologic Society
  • Laramie County Medical Society
  • Wyoming Medical Association
  • Wyoming Medical Society

A native of Cheyenne, Wyoming, Dr. Seitz’s roots run deep in the community where he was born and raised. Alongside his wife and three children, he embraces the Wyoming lifestyle, indulging in outdoor pursuits like fishing, camping, hiking, and skiing whenever possible.

Tamara Mason, DNP, FNP-C

Practices in our Cheyenne and Torrington clinics

Bachelor of Science in Nursing from University of Wyoming • Doctor of Nursing Practice from University of Wyoming • Board-certified Family Nurse Practitioner by American Association of Nurse Practitioners • Member of Sigma Theta Tau • Member of American Association of Nurse Practitioners 

Driven by a desire to provide high-quality, evidence-based care, Tamara (“Tami”) Mason earned her doctoral degree from the University of Wyoming and became a nurse practitioner. She brings more than two decades of nursing experience in both inpatient and outpatient settings to her practice here at Seitz.

A Wyoming native, Tami grew up on a ranch near Yoder, then settled in Cheyenne with her husband to raise their three daughters. Together with her family, Tami enjoys camping, hiking, and taking in all types of sporting events at the University of Wyoming. In her spare time, she also enjoys traveling, reading, and playing in two bell choirs at her church.

Colleen Basham, MSN, APRN, FNP-C

Practices in our Wellington clinic

Bachelor & Master of Science in Nursing from Regis University • Board-Certified Family Nurse Practitioner by American Academy of Nurse Practitioners • Member of American Association of Nurse Practitioners

Colleen Basham is a certified nurse practitioner, specializing in dermatology. After five years working in an all-natural spa, she was inspired to pursue a nursing degree at Regis University where she graduated with honors. She then went on to work in cardiology, internal medicine and public health before returning to Regis University for her nurse practitioner degree. With a range of medical experience under her belt, Colleen has found her way back to her original love – skincare. Having struggled with her own skin issues over the years, she is forever passionate about helping others feel truly confident in their skin.

As an Austin native (that’s right, y’all), she considers Colorado home after almost two decades in Northern Colorado. When not exploring all things skincare, Colleen loves to take advantage of everything Colorado has to offer, adventuring with friends and her loyal pup, Althea. She is honored to be part of the Seitz Dermatology team, excited to connect with the Wellington community and eager to start helping patients reach their skin health goals.


Right next door to our Cheyenne clinic, you’ll find the Bellanova Medspa.

From microdermabrasion to massage, pedicures to professional makeup application, the Bellanova Medspa is primed to pamper you from head to toe. Stop in and indulge yourself with one of their many spa services, or make an appointment for a cut and color in the full-service salon!

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