sentences:  He also served as the president of the American Medical Association in 1897–98.In 1898, following the outbreak of the Spanish–American War, he was appointed as chief surgeon of the United States Sixth Army Corps with the rank of lieutenant-colonel and chief of staff, and was involved in the Siege of Santiago in 1900.Sometime during his career, he was also Surgeon General of the National Guard of Illinois and Wisconsin, and founded the Association of Military Surgeons of the State of Illinois, which he presided over until his death.