Born in Logan, Ill., Oct. 13, 1890, John Samuel Bouslog had his elementary and high school education in Illinois and Oklahoma and his university and medical schooling in Colorado. Such a background must necessarily produce a true American with his whole life directed to the advancement of his country's welfare, especially in his own field of activity. Possessed of boundless energy, for years he has worked incessantly and tirelessly in behalf of organized medicine. He has served county, state, and national medical societies in developing and perfecting plans for voluntary health insurance, and he has been a potent influence in directing legislation toward better medical practices and controls. His work has been on local, state, and national levels, in both lay and medical circles. Now, at the halfway mark of the century, in his sixtieth year, he is climaxing his years of service to the profession as President of the Radiological Society of North America. Quite early in his professional life Dr. Bouslog was made secretary of the Colorado State Medical Society and thus became interested in organized medicine. Since that time, he has worked constantly for its advancement. He served the society as constitutional secretary from September 1933 to February 1943, and during World War II, in the absence of the executive secretary, Mr. Harvey Sethman. From September 1937 to February 1943, he was chairman of the Board of Trustees of the society and in 1946 he was elected to the presidency to serve for the term of 1947–48. He is a member of the staff of St. Anthony's, Beth Israel, Children's, Colorado General, and St. Luke's Hospitals, and the Jewish Consumptive Relief Society and Swedish National Sanatorium. Dr. Bouslog has exerted his influence, as he should, by membership and mingling in specialized and non-specialized groups. His hobbies center on wild flowers and birds and coin collecting. Among his numerous affiliations are: Acacia, Bird Club, Denver Chamber of Commerce, Colorado Mountain Club, Denver Athletic Club, Knights Templars, and Shrine. On the scientific side he is a diplomate of the American Board of Radiology, a fellow of the American Medical Association, the American College of Chest Physicians, and the American College of Radiology, and a member of the American Association for the Advancement of Science, the American Cancer Society, the American Radium Society, the American Roentgen Ray Society, the Denver County Medical Society, the Denver Radiological Club, and the Rocky Mountain Radiological Society. His membership in these organizations has been and still is an active one, and he has held many offices, with vigor and loyalty.