Alpinist and backcountry skier Michael Kennedy is famous worldwide for his stewardship of Climbing Magazine as well as his mountaineering accomplishments.

Ski widths have changed greatly over the years, here is an overview from 1996 before the wider ski revolution took off.

S System for rating ski descents was developed in Europe, it is a flawed system but in wide use, described here for ski mountaineering.

Extreme skiing has gone through many phases, it began as steep skiing in the Alps, was briefly taken over by the U.S. ski industry, and now is back to its rightful place.