John “Verm” Sherman is arguably the most prolific and experienced American boulderer, in the last 43 years having visited over 600 areas and climbing over 20,000 problems, thousands being first ascents. During the mid-80s to early-90s, Sherman was the foremost developer of bouldering at Hueco Tanks. He wrote the first Hueco Tanks bouldering guide and in the process introduced the V-system of grading boulder problems, now an international standard. He also designed the first commercially available bouldering pad. He is particularly fond of ground-up highball first ascents—high risk propositions requiring outstanding skill and judgment—a passion that started in the pre-pad era and continues today.