Final answer:
Dr. Andrew Taylor Still began practicing Osteopathy in the late 19th century and established the American School of Osteopathy in 1892.
Step-by-step explanation:
Dr. Andrew Taylor Still began practicing Osteopathy in the late 19th century. Osteopathy is a form of alternative medicine that emphasizes physical manipulation of the body's muscle tissue and bones. The American School of Osteopathy, founded by Dr. Still in 1892 in Kirksville, Missouri, was the culmination of his development of osteopathic medicine. Unfortunately, the provided references do not contain specific information about Dr. Still or the exact year he started practicing osteopathy. However, it is well documented that his practice and school were already established by the 1890s.