In 2013, Terreance Holley founded TK Firearms Training LLC. It was the continuation of more than 20 years spent studying firearms, self-defense, combat, and other related fields. Today the NRA-certified instructor teaches basic courses in pistols, rifles, and shotguns—as well as private lessons. TK Firearms Training LLC also specializes in concealed-carry classes for certifications in Illinois, Utah, Florida, and Wisconsin.