John Sherman (climber)

John Sherman (born 1959), nicknamed Verm (short for "Vermin") is an American rock climber and a pioneer in the promotion and development of the climbing discipline of bouldering. He is also a climbing writer and outdoor photographer, and the originator of the V-grade system (after his nickname), for grading the technical difficulty of boulder problems, which has since become one of the dominant grading systems worldwide.

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