Andrew "Bob" Harris, 32, made history on Aug. 18 when he reached the summit, 13,776 feet above Jackson Hole, Wyo., at 5:15pm local time, Climbing reports. "With Bob, limits are arbitrary," says his sister, Amy Harris, who organized the adventure with her husband, Max Hammer.
Their choice of mountain hewed to her brother's preference for exposed slab, and there was certainly plenty of it. A video teasing the 12-hour trek shows Harris, called "Ducky" by his family, making his way across nail-biting rock faces. As Outside notes, scaling the spiraling peak—"like a cardboard cutout of the biggest, most jagged peaks someone could imagine"—is tough work. It begins with a steep 6.5-mile climb to gain 5,000 feet, and then the hard part starts.