Jack Roberts climbed for 39 years, more than 30 of them in Colorado. He was a published author with the second edition of his ice climbing guide to Colorado, “Colorado Ice,” which was a finalist in the guidebook category at the 2006 Banff Book Festival. He was a frequent contributor to Climbing and Rock and Ice magazines, and the American Alpine Journal. He was awarded recognition at the Banff Book Festival as having written the finest article of the year in the 1997 Canadian Alpine Journal. His last article was published in Alpinist No. 20, under the Mount Huntington story.
Jack was frequently requested as guest lecturer, presentor, and clinic instructor at the Ouray Ice Festival, Pont Rouge (Festiglace) ice festival, Bozeman Ice Festival, Cody Ice Festival, and many others.
His climbing career began in 1968 in Southern California where he climbed at Tahquitz, Joshua Tree, and Yosemite. He eventually became a part of the influential Stonemasters Climbing group and went on to ascend big walls in Yosemite. Many of them were second ascents—The Shield, Zodiac, Tangerine Trip, Tis-Sa-Ack, Cosmos, Gobi Wall, El Cap Towers Right Side, Mescalito. Later, he gravitated to alpine climbing in Europe, Canada, and Alaska where he established first ascents on Mount Huntington, Denali, Mount Lewis, Mount Kennedy, and others. With Dale Bard, he did the first free ascent of Polar Circus and with Tobin Sorenson did the first winter ascent of the North Face on Mount Robson and the first winter ascent of the Central Couloir on Mount Kitchener.