John McCrae was a Canadian physician, poet, and soldier who lived from 1872 to 1918. He is best known for writing the World War I-era poem In Flanders Fields, which has become one of the most enduring symbols of remembrance for those who served in war. McCrae was born in Guelph, Ontario, and pursued medical studies at the University of Toronto, later teaching pathology at McGill University. He served as a doctor and as an officer in the Canadian forces, achieving the rank of Lieutenant-Colonel and holding roles with the Royal Canadian Artillery and the Canadian Field Artillery during World War I. His career combined medical practice, military service, and literary achievement, making him a notable figure in Canadian history.