PROF. WILLIAM GEORGE MACCALLOM, the eminent American pathologist, who died on February 3 at the age of sixty-nine, was born at Dunnville, Ontario, on April 18, 1874, the son of a medical man. After qualifying at the University of Toronto in 1894 and at the Johns Hopkins University School of Medicine in 1897, he held the post of intern and later of resident pathologist at the Johns Hopkins Hospital. In 1899 he was appointed assistant in pathology at Johns Hopkins, where he afterwards became assistant professor and professor in pathological physiology and lecturer in forensic medicine. In 1909 he was appointed professor of pathology at the Columbia University College of Physicians and Surgeons, as well as pathologist at the German Hospital and Presbyterian Hospital. In 1917 he succeeded the well-known pathologist Dr. William H. Welch as professor of pathology at Johns Hopkins, and held this appointment until the spring of 1943.
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ROLLESTON, J. Prof. W. G. MacCallum. Nature 153, 581 (1944). https://doi.org/10.1038/153581a0