Bill Harsey is a custom knife maker, designing and crafting one-of-a-kind folding and fixed blade knives, often to order. He is best known for his collaboration projects, in which he serves as knife designer for various knife companies. Sold his first knife in 1979. One of Harsey's most significant designs was that of the Yarborough Knife, which is named after Lt. Gen. William P. Yarborough, known as the "father of modern Special Forces." The Yarborough Knife is presented to each graduate of the United States Army Special Forces Qualification Course, with each of these knives possessing its own serial number, and logged in an official record book maintained by the United States Army Special Operations Command.