High Quality Content by WIKIPEDIA articles! Tillson Lever Harrison (January 7, 1881 – January 10, 1947) was a Canadian physician, army officer and adventurer. Moving to New York and enlisting in the United States Army at an early age, he later returned to Canada to attend the University of Toronto before practising as a physician in a number of dangerous positions, such as the Chief of Medical Staff to Pancho Villa and the doctor for the Chinese Labour Corps, a workforce of over 200,000 men. After World War I, he traveled throughout the Middle East, treating venereal disease and operating an X-ray facility in Lod, Israel.