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Sean Petersmark

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.