Mark Postle

Location Jackson, Wy

Role Senior Guide, Lead Guide

Years Guiding 30

About Mark Postle

Mark our Head Guide here at JHMG has been instructing and guiding for us in Jackson since 2003. He most commonly splits his guiding year between ascents of Aconcagua during the Argentine summer, at AMS in Talkeetna, Alaska as a senior guide on Denali, and here in the Tetons. He has also travelled and climbed extensively in Europe and in Patagonia and made several expeditions to the Himalaya successfully ascending both Lhotse (8,516 meters) and Ama Dablam in Nepal. Mark holds a B.S. degree with honors in organic chemistry. He enjoys pursuing all aspects of the sport from bouldering to expedition climbing on the great high altitude peaks of the world. An avid technical climber, Mark has climbed over fifty 5.13’s, including the Smith Rock test piece, White Wedding (5.14a).  What he loves the most about guiding in the Tetons and Winds is showing guests of all backgrounds and experience levels the skills they need to achieve their goals in rugged technical terrain. People who climb with Mark, love his straightforward and fair approach, and his great sense of humor.


  • - AMGA Aspirant Rock Guide
  • - Wilderness EMT


  • Postle and the JHMG team made for a great experience for our three kids.  The low key, safe and flexible orientation and instruction was perfect.  Even our 4 year old blazed up and down from great heights!

    — M. Konchar
  • My experiences with JHMG have been uniformly outstanding.   Each guide that has worked with me over the years has taken a genuine interest in helping me advance my climbing.  The levels of professionalism, expertise, and interest in teaching among the guides I have worked with has been top-notch.

    — David Matthews
  • If you want to climb safely with confidence and learn about WHAT you are actually doing and climbing…Pick JHMG.  Hands down the best guys for the job!  YEARS of experience and professionalism are very obvious from the moment you step inside the shop.  Nice guys, well trained and fun to climb with!

    — Darren Davis
  • I just wanted to thank you for setting us up with such unbelievable guides.  They were absolutely solid, professional and fun to be around.  We couldn’t have had better, nor better results.  That climb of the Grand is something I’ll never forget.  I will be back to climb Mt. Moran next.

    —  Paul Edelbrock
  • Thanks to Jackson Hole Mountain Guides for your time, effort and patience to get this old man to the top of the Grand Teton on my 60th anniversary climb. I am proud of you and your excellent climbing school.

    — Paul Petzoldt, the first Teton guide and founder of NOLS and Exum Guide Service
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