Sean Petersmark’s journey into emergency medicine is deeply rooted in a profound passion for outdoor education and wilderness facilitation. Originally a professional guide leading backpacking and snowshoeing expeditions across Western Washington, they discovered their calling for patient care after earning a Wilderness First Responder (WFR) certification. Driven by a desire to master the critical problem-solving and interpersonal aspects of medicine, Sean became an EMT, spending two years honing rapid patient assessment and triage skills on a high-volume ambulance in busy King County. In January 2025, they took this extensive field experience to the fire service, stepping into the role of a full-time career Firefighter/EMT. As an instructor, Sean operates on the philosophy that true mastery of a subject is demonstrated through the ability to teach it. For students, they expertly blend the expedition mindset—focusing on long-term care, prevention, and creative problem-solving—with the rigorous, fast-paced clinical assessments of urban EMS, empowering learners of all backgrounds to approach medical emergencies with profound confidence.
The Journey to Remote Medicine
After ditching the corporate 9-5 world I became a hiking, snowshoeing, and backpacking guide. That job paid for me to get my WFR. Before that course I never thought I would get into medicine, I get queasy when I get my blood drawn. But through that course I discovered a passion and interest in EMS. I continued to guide but simultaneously obtained my EMT-B and started working on a private ambulance to see if it was the right career for me. I eventually progressed and became a full time fightfire/EMT-B in an urban environment. After two years of working on the ambulance I wanted to elevate my knowledge by becoming an instructor. A mentor once told me 'anyone can pay for certifications, teaching shows mastery of a subject.' Additionally, I knew how important these introductory courses can be for one's trajectory. I can directly point to my initial WFR course and how that class turned me from a zero-medical background to now working on ambulances and wanting to teach others medicine.
Specialized Industries
Mountain Backcountry Guiding
Youth Expedition Safety
Remote Medicine
Beyond medicine, I love a good adventure—I previously biked 4,046 miles across the US, raising $5,000 to help build affordable housing at 11 different sites along my route. In my free time, you can usually find me bird watching, listening to 90s punk rock, or making old-school mix CDs for my friends and family. My ultimate life goal? Getting sponsored as an outdoor adventure pro by Cheez-Its.
Teaching Philosopy
I start every class with a pun. I strive to create a learning environment that is safe, fun, and directly useful for my students. The topics may be serious but I think growth and learning flourish in an environment that can be both professional and foster authenticity. Medicine is a practice, not perfection, and I hope to use my experience for my students to learn from my mistakes and be better providers than myself. Moreover, I try to mold my lessons into a context that is relevant to my students. Finally, while I love to geek out on the theory and bookwork of EMS, I push to get as much practical hands-on time for my students.
Why I Choose to Teach
I love teaching because it forces me to be creative, continuously learn, and connect with people from all over the world. Our students come from incredibly diverse backgrounds, which creates a dynamic classroom experience that goes way beyond just the curriculum. Having a room full of students expecting answers pushes me to stay at the forefront of medical research and know my material inside and out, which ultimately makes me a better medical provider. Plus, the outdoor world is a small place. I frequently run into former students out in the field, and I always teach with the mindset that one day, they might be the ones taking care of me!
Professional Certifications & Licensures
ESCI
FOTS
NREMT
WA DOH EMT-B
WA ESE
RMT WFR
Most Memorable Field Experience
I’ve been on two separate rescues for a Great Pacific Octopus stranded on a beach and a bald eagle stuck in a tree. Both survived.
https://www.goskagit.com/townnews/pets/giant-pacific-octopus-rescued-at-bay-view-state-park/article_e1a71e5c-c510-11ed-871f-833a453b0762.html
https://komonews.com/news/local/injured-bald-eagle-rescue-washington-department-of-fish-and-wildlife-police-burlington-firefighters-tree-in-bow-whatcom-county-wildlife-center-treatment-recovery