Yasso joined Runner's World in 1987 to develop the groundbreaking Runner's World Race Sponsorship Program, creating a vehicle for Runner's World to work with over 7,000 races representing 4 million runners per year. Inducted into the Running USA Hall of Champions.

Yasso also invented the Yasso 800s, a marathon-training schedule used by thousands around the world. He is one of the few people to have completed races on all seven continents from the Antarctica marathon to the Mt. Kilimanjaro marathon. In 1987, Yasso won the U.S. National Biathlon Long Course Championship and won the Smoky Mountain Marathon in 1998. He has also completed the Ironman five times and the Badwater 146 through Death Valley. He has also cycled, unsupported and by himself, across the country twice.