Personalized Family Medicine For a Lifetime

When you choose a Star Valley Medical Center family medicine provider, you’re not only getting a board-certified healthcare provider, you’re getting a life-long, trusted friend. Our family medicine physicians are dedicated to improving your quality of life, from birth to each stage of life that follows.


Our Board-Certified Family Physicians 

Clayton Brown, MD

Specialty: Family Practice, Obstetrics, Pediatrics, Women’s Health
Location: Afton Clinic

Medical School: University of Washington
Residency: University of Texas Health Northeast
Fellowship: Altru Family Medicine – Obstetrics


Allen Carter, MD

Specialty: Allergy, Family Practice, Pediatrics, Women’s Health
Location: Afton Clinic

Medical School: University of Washington
Residency: University of Utah


Martha Hageman, MD

Specialty: Family Practice, Pediatrics, Women’s Health
Location: Thayne Clinic

Medical School: University of Cincinnati College of Medicine
Residency: Duluth Graduate Medical Education Council


Niki Milleson, DO

Specialty: Emergency Medicine, Family Practice, Osteopathic Manipulation, Pediatrics, Women’s Health
Locations: Alpine & Thayne Clinics

Medical School: College of Osteopathic Medicine of the Pacific, Western University of Health Sciences
Residency: Family Medicine, Eastern Maine Medical Center


Christian Morgan, MD

Specialty: Family Practice, Obstetrics, Pediatrics, Women’s Health
Location: Afton Clinic

Medical School:  Ponce School of Medicine & Health Sciences
Residency: Family Medicine, Natividad Medical Center
Fellowship: Obstetrics, University of Utah


Sean Knighton, APRN

Specialty: Family Practice, Pediatrics
Location: Alpine & Thayne Clinics

MSN:  Master of Science in Nursing, Gonzaga University
BSN: Nursing, Honors, Montana State University


Jason Sharp, MD

Specialty: Family Practice, Pediatrics, Women’s Health
Locations: Alpine & Thayne Clinics

Medical School:  University of Utah School of Medicine
Residency:Southern Illinois University
Fellowship:Southern Illinois University – Sports Medicine


Joe Dayton, PA-C

Specialty: Family Practice, Pediatrics
Location: Cokeville Clinics

MS:  Master of Physician Assistant Studies
BS: Business Administration, Utah Valley University


Four Convenient Locations in Western Wyoming

Afton Clinic

Alpine Clinic

Cokeville Clinic

Thayne Clinic


Providing high-quality, patient-responsive medical care for a lifetime

People who have an ongoing relationship with their family healthcare provider often experience better continuity of care, higher quality of life, and lower health care costs.

Here’s why:

  1. Family doctors follow your health and well being throughout your life cycle.
  2. They are familiar with your ongoing medical and family history.
  3. They help manage chronic conditions (e.g., heart disease, diabetes and arthritis).
  4. If needed, they refer you to specialists who fit your specific needs and personality.
    • From there, they act as your guardian to ensure medications and treatments (ordered by specialists) do not result in dangerous drug interactions, and contraindications are respected.

Simply put, if your doctor knows what’s normal for you, they’re better equipped to determine what’s not normal. Physicians with intimate knowledge of your medical history can often make an earlier diagnosis than a doctor who does not have prior knowledge of your health.


Our family medicine physicians are dedicated to improving your quality of life, from birth to each stage of life that follows. To learn more or to request an appointment call 307-885-5800 or use our easy online contact form.