"From our first meeting in a Boulder coffee shop in the mid 1990s, Mark has proven to be the most loyal of friends. Across time and space his emotional and intelectual availability has created a family tie of sorts. Over two decades we got to do a handful of trips together, from Alaska to Antartica. I will never forget his lending leadership to hold off reckless producers during a commercial shoot in Antartica and ten years later putting a stop when several of our own tried to chew too fast during a trip to Denali. His vision and creativity as a climber influenced me heavily. Skill is irrelevant unless it is used in a provoking manner. A vanguardist at heart, he could always see where the next blind spot was, and was unafraid to jump right into it."