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“I traded fluorescent lights for UV light.”

That’s how I describe the shift from a career in medicine to pursuing the passion that had quietly shaped me for 21 years. What began as a pull toward climbing and skiing evolved into my life's work of using the mountains as a creative space for mastering the craft of moving through the mountains and as a tool for building meaningful connections with the people and wild spaces we meet a long the way.

Today, I work full time as a mountain guide, creating safe, transformative experiences in complex alpine terrain while continuing to pursue technical personal objectives in remote, alpine ranges around the world. I am a IFMGA Aspirant/AMGA professional guide based in the Rocky Mountain West, with more than 50 expeditions in Alaska’s Denali Range and over two decades of professional climbing experience around the world.

At the center of my work is a simple mission: to help people grow and move confidently in challenging environments, develop real confidence in the mountains, and to become more present and aware of ourselves and the environment around us.

Certifications: ​

  • AMGA Assistant Alpine Guide

  • AMGA Assistant Rock Guide 

  • AMGA Aspirant Ski Guide 

  • American Avalanche Association AVY PRO 2

  • Wilderness First Responder

  • Leave No Trace 

Significant Ascents & Descents

  • Cassin Ridge, Denali, 5.8, AI4, V 2750m

  • Denali National Park VIP Climbing Ranger

  • 12 seasons and 54 Expeditions in the Interior Denali Range with multiple ascents of over 20 technical alpine routes in the Ruth Gorge and Interior Denali Range​​

  • 5 out of 8 Denali Summits via the West Buttress

  • Multiple guided ascents of technical alpine routes throughout North America

  • Ice and mixed routes up to WI5+ M8

    • Talisman WI5 M6​

    • Birdbrain Boulevard WI5+ M5

    • The Nutcracker WI5+ M8​

    • Winter Dance WI5 M8

    • Bridal Veil Falls WI5+

  • 30+ guided ascents of Mount Rainier via 4 routes

  • Multiple rock routes up to 5.12 in venues such as Zion and Yosemite

  • 17 bigwall ascents in Zion National Park & Yosemite including 5 rope solo ascents of Zion bigwalls (Touchstone, Prodigal Son, Crack in the Cosmic Egg, Disco Inferno and Lunar Ecstasy)

  • Ski descent off the Fuhrer Finger, Mount Rainier

  • Ski Descent of Japanese Couloir Mount Barille, AK 

  • Ski Descent of the Grand Teton via the Ford-Stettner

  • Numerous technical ski descents across United States, Patagonia, and Europe

What Moves You?

Contact Me

 

© 2026 by Bobby Cosker. Powered and secured by Wix 

 

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