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Wyoming Medical Associates


General Surgery & Vascular Surgery Located in Gillette WY & Casper WY.

Welcome to Wyoming Medical Associates


Jacob Rinker, MD, FACS, was born and raised in the Gillette area, was actually born in Campbell County Hospital. Jacob Rinker, MD, FACS, is board certified by the American Board of Surgery in General Surgery.

He did an internship and residency in Des Moines, IA in General Surgery.  He currently sees patients at Wyoming Medical Associates in Gillette and Casper, Wyoming. Dr. Rinker earned his Bachelor of Science in Cell Biology and Neuroscience at Montana State University in Bozeman. He then received his medical degree from the University of Washington School of Medicine in Seattle before completing a General Surgery internship at Iowa Methodist Medical Center in Des Moines.

Dedicated to staying abreast of the latest advancements in his field, Dr. Rinker is a member of the American College of Surgeons, American Vein Lymphatic Society (AVLS), and Wyoming Medical Society. He is also an instructor in Advanced Trauma and Life Support (ATLS). He has given several presentations on his research throughout his career.

Trisha Mendenhall MSN, APRN

Trisha Mendenhall MSN, APRN is a longtime Gillette resident. She is a proud graduate of Campbell County High School and the nursing college at Gillette College. Trisha also attended the University of Wyoming, where she earned her undergraduate degree in nursing.

Before transitioning to Advanced Practice Nursing, Trisha practiced as a Registered Nurse for 12 years at Campbell County Health. Much of her career has been dedicated to caring for critically ill patients in Intensive Care and acute care within inpatient and outpatient surgery. After a decade of practice, Trisha chose to continue her medical education. She earned a master’s degree in Nursing, specializing as a Family Nurse Practitioner. 

About Wyoming Medical Associates

Telehealth — or telemedicine — is a healthcare solution that allows you to meet with your doctor virtually instead of going to the office. Our 100% HIPAA-compliant system uses a two-way, high definition video, so we can talk face-to-face as if we’re in the same room together.
With Telehealth, you can also:
  • Submit your medication list, allergies, ID cards, and medical history in advance
  • Chat or share photos describing your symptoms
  • Have prescriptions electronically sent to your pharmacy
  • Securely pay online for your virtual visit
This streamlined approach originally evolved to help expand medical care to men, women, and children living in remote areas. Today, 76% of hospitals use Telehealth technology, and US employers could save as much as $6 billion a year by making telemedicine technology available to their employees. But the advantages of Telehealth go far beyond financial savings.

Meet Our Qualified Providers

Professional Team

Dr. Jacob Rinker

Chief Medical Officer

Trisha Mendenhall

Nurse Practitioner

What Our Patients Say

  • 5 star review  There was an unforeseen difficulty with my procedure. Rather than taking the chance of injuring me, Dr. Rinker referred me to a surgeon in another location where it could be performed in a safer manner. I respect him for taking that action. Trish, the APRN in this practice, is very competent and easy to work with. I would recommend this practice highly.

    thumb Lynda Hughes
    September 16, 2021

    5 star review  Excellent place to call when looking for relief from medical conditions. I found their staff to be very relatable, caring, and knowledgeable.

    thumb Brett Hansen
    January 27, 2021

    5 star review  Dr. Rinker took the time to explain my vein condition to ensure I understood what was going on. He explained the processes available for treating it, answering my questions along the way, explaining during procedures what was happening at particular intervals. His staff have been incredibly helpful and friendly, and being able to have vein procedures and follow-up ultrasounds in one practice has made the process very smooth. I've been pleased overall with my experience.

    thumb Sarah C
    September 7, 2021
  • 5 star review  Very comfortable with all the staff and Dr. Rinker. He was very knowledgeable and explained everything precisely. Everyone listened to my concerns and answered all questions. I would highly recommend.

    thumb RC Stypa
    September 15, 2021

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