Karl Meltzer

Karl Meltzer, born December 8, 1967 and nicknamed Speedgoat Karl, is an ultrarunner and ultrarunning coach based in Sandy, Utah. He has won more 100-mile ultramarathons than any other ultramarathoner and has held speed records on major United States trails, including the Appalachian Trail and the Pony Express Trail. He has been a professional ultramarathoner since 1999 and a coach since 2007. On September 18, 2016, he completed the 2,190 miles of the Appalachian Trail across 14 states in 45 days 22 hours and 38 minutes, an effort featured in the 2017 documentary Made To Be Broken. Joe McConaughy eclipsed that record in September 2017, and the current fastest known time was set by Tara Dower in 2024. Meltzer is also the race director of the Speedgoat 50K at the Snowbird Ski Resort.