Earl V. Shaffer (November 8, 1918 – May 5, 2002), was an American outdoorsman and author known from 1948 as The Crazy One (and eventually as The Original Crazy One) for attempting what became the first documented hiking trip in a single season over the entire length of the Appalachian Trail (AT). He also worked as a carpenter, a soldier specializing in radar and radio installation, and an antique dealer.
Shaffer was born in rural York, Pennsylvania, which lies approximately twenty miles from the AT, and which he always made his home. In the late 1930s he hiked with a neighbor and close friend, Walter Winemiller, and they made plans to hike the whole of the AT together, after the war that they anticipated the US would eventually enter.
Shaffer enlisted in the army in 1941, was well along in his training at the time of the Pearl Harbor attack, and did arduous and risky service as a forward-area radioman in the South Pacific into 1945. His friend Winemiller served in the Pacific Theater as well, and died in the Iwo Jima landings. Shaffer said he did the trail to "walk the war out of my system".
In 1948, he began the journey from Mt. Oglethorpe, in Georgia (the trail's southern end at that time). With sparse equipment that would be regarded as grossly inadequate by most of the through-hikers since – he used worn boots, his army rucksack, and no stove or tent – he reached Mt. Katahdin in Maine, in 124 days, averaging 17 miles per day. Especially after he overcame the skepticism of Appalachian Trail Conference officials (who initially believed his claim of completing the route was obviously fraudulent), his trip raised public awareness of the Trail. He privately published his memoir of the experience; his book, Walking With Spring (ISBN ), reflects the experience of most AT hikers, that the project of making the whole trip in the northward direction (the most common choice), is furthered by a start timed to the weather in the Georgia mountains, and by continually taking advantage of the northward progress of milder weather.