Daniel David Palmer performed the first chiropractic adjustment, on deaf janitor Harvey Lillard.

Daniel David Palmer was a Canadian-born American spiritualist and activist best known for creating chiropractic. Palmer was born in Pickering Township, Canada West, but emigrated to the United States in 1865. He was also an avid proponent of pseudoscientific alternative medicine such as magnetic healing. Palmer opposed anything he thought to be associated with mainstream medicine, such as vaccination.

The history of chiropractic began in 1895 when Daniel David Palmer of Iowa performed the first chiropractic adjustment on a partially deaf janitor, Harvey Lillard. While Lillard was working without his shirt on in Palmer's office, Lillard bent over to empty the trash can. Palmer noticed that Lillard had a vertebra out of position. He asked Lillard what happened, and Lillard replied, "I moved the wrong way, and I heard a 'pop' in my back, and that's when I lost my hearing." Palmer, who was also involved in many other natural healing philosophies, had Lillard lie face down on the floor and proceeded with the adjustment. The next day, Lillard told Palmer, "I can hear that rackets on the streets." This experience led Palmer to open a school of chiropractic two years later. Rev. Samuel H. Weed coined the word "chiropractic" by combining the Greek words cheiro (hand) and praktikos.