Andrew “Bob” Harris, who goes by “Duckey” is from Nevada and he’s become the first climber with Down syndrome to conquer the mighty Grand Teton.

At 32, he 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. The video teases the 12-hour trek of him making his way across huge rock.

Full story at Newser.com