El Potrero Chico Guides S.A.de C.V. is Owned and Operated by Mark Grundon an AMGA Certified Rock Guide
Mark has been guiding from Alaska to Colorado for the last ten years. He also currently spits his time between Yosemite National Park and El Potrero Chico. He also guides trips on Mexico's volcano Pico de Orizaba. He recently retired from ski patrol after seven winters to follow his deeper passion: climbing. Mark is a strong believer in “living the dream”, and following your passions whatever they may be. Mark enjoys sharing a rope with everyone from Yosemite rock stars to first time climbers. He has made one day ascents of El Cap and Half Dome in Yosemite. Mark has his EMT, and a Leave No Trace trainer certification.