Philip Allan Cheyne Ketchum was born July 20, 1899 in Cobourg, Ontario to parents Judge and Mrs. Ketchum. He attended Trinity College School from 1912 to 1916. Following matriculation he served as a Junior Master at Lakefield Preparatory School. In 1918 he was accepted into the Royal Flying Corps. and went overseas in July, 1918 for training. In December of 1918, Ketchum was made Second Lieutenant as a pilot; however with the end of the War, Ketchum returned to Ontario in 1919 to pursue his academic career. He attended Trinity College at the University of Toronto from 1919-1923. While at Trinity College, Ketchum was the President of the University Rugby Club, President of the Trinity Athletic Association and Vice President of the Trinity College Literary Institute. After graduation in 1923, he taught for a year at the Upper Canada Preparatory School before returning to TCS as a master at the Junior School. During this time Ketchum earned a Bachelor of Pedagogy from the University of Toronto. In 1927 he entered Emmanuel College, Cambridge where he completed his BA. Upon graduation in 1929 he taught at St. Mark's School in Massachussets. In 1933, at the age of 32, Ketchum became the Headmaster of Trinity College School. He held this post until 1962, at which time he was made a lifetime member of the Board of Governors. Ketchum died on July 21, 1964.