AMGA Certified Alpine and Rock Guide, guide for 29 years, extensive climbs in Canada and US, including five routes on El Capitan and many ascents in the southwest. Expeditions and guiding in Peru, Ecuador, Argentina, and Mount Rainier. Expeditions to Uzbekistan, Aksu and Asan-Usan valleys in Kyrgyzstan. First ascent of northwest ridge of Gasherbrum IV in Pakistan. Only American to summit Gasherbrum IV. Expeditions to Everest and Gasherbrum II. Guided Pik Communism, Pik Lenin, Pik Korzhenevskaya, and Khan Tengri (Kyrgystan). One-day ascents Aconcagua and Pik Korzhenevskaya. Five seasons guiding and teaching up to Grade VI ice and mixed climbing in New Hampshire. Examiner and instructor in AMGA Rock and Alpine disciplines. Recipient of AMGA Lifetime Guide Achievement Award 2004. Exum Technical Supervisor.