Sinclair M. Adams was a faculty member at Appleby School from 1915 to 1918 and taught Classics. He enlisted in the Canadian Expeditionary Force in June 1918, but was soon discharged in November 1918 due to the end of the War. He then became a teacher at Trinity College.

Edmund Vere (E.V.) (Ted) Brown was born July 31, 1900 and was one of the original students when Appleby College opened in September 1911. He attended Appleby until he graduated in June 1916. He enlisted and was a cadet with the Royal Air Force during World War 1. He graduated from McGill University with a degree in Engineering. In September 1924 he returned to Appleby as a Master and taught history and later mathematics until he left in June 1932 to become Headmaster of the Junior School at Ridley College. During his time at Appleby, he initiated ‘Sunday Hikes’ for the boys on campus as well as running a summer camp at Farlane, in Northern Ontario at Red Deer Lake.

In June 1926 he married Ailsa Maclver and his children, Carol and Timothy were born in 1929 and 1934 respectively. In the summer of 1930, E.V. Brown had a small cottage constructed on campus for his growing family.

He died May 7, 1971.

Thomas B. Colley began teaching at Appleby School in 1914. He earlier studied classics in Britain and at the University of Toronto, and his career in teaching at Upper Canada College from 1903 meant he was an experienced Master. During World War 1, he served overseas. He was also known as a strict disciplinarian. At Appleby he taught Classics and Ancient History and was the housemaster of School House, which later became known as Colley House. During the 1920s and 1930s, he was involved with the Appleby College Cadet Corps. Thomas Colley died on Sept. 2, 1949.

Sharon Creelman was a Faculty member at Appleby College and Athletics Director from 2001 - 2021. She was also the coach of the field hockey team.

H.C. Hardwick was a faculty member at Appleby College who taught English and French from 1929 to 1964. He was also the editor of The Argus for many years, as well as being in charge of the school plays. He died on Jan. 14, 1982 at the age of 81.

Campbell Mackay was born on October 31, 1945 in Glasgow, Scotland. He began teaching at Appleby College in 1985 as the Head of the English Department. In 1990 he accepted the position of Assistant Headmaster of Academics. in early 2000, he was appointed the first Appleby College Associate Headmaster, being responsible for all discipline matters, supervision of the School Directors, Housemaster and Director of Residential Life. He also oversaw the evaluation, recruitment, training and assignment of all faculty members. He would go on to become the Assistant Head of Academics. He retired in 2005 and passed away on August 15, 2006.

Dave Manbert was born in 1938 and began attending Appleby College as a student in 1948. He graduated in 1957, he attended the University of Toronto to obtain his teaching certificate. In 1964 he began teaching at Appleby College. He taught English, Latin and History over the years, but is known for teaching geography and being the Head of the Geography Department from 1969 until his retirement. He was the Athletic Director from 1973 to 1985. He coached football, softball and hockey at Appleby. He was instrumental in starting softball and baseball at Appleby. He retired in June 1994. At his retirement in 1994, the school introduced The David W.L. Manbert Award, awarded to the Senior Student who had demonstrated a sense of humanitarianism while at the school. He died January 12, 2020.

Vernon Powell was the one Master who was killed during World War I. He was one of the small cadre of teachers who joined founding Headmaster John Guest in opening Appleby College in September 1911, and proved to be an extraordinarily popular and respected presence. During his three-year tenure he was the first Housemaster in the McCraney House, which came to be known as "Powell's", and the originator of the Appleby Dramatic Club. He was described as a man with "resourcefulness, quick sympathy, unquenchable humour, and a wonderful faculty for 'making things go' ". The scion of a family of soldiers, he left Appleby in 1914 to join a cavalry regiment, but soon transferred to the Canadian Field Artillery. He served in the 53rd Battery. He subsequently proved himself to be among the finest officers, earning the enthusiastic devotion of his men. He was awarded the Military Cross for conspicuous gallantry at the Battle of the Somme, where he was wounded. In October 1917, he burnt his hands badly in extinguishing a fire among live shells in a gun-pit, his quick action saving many lives. In December of that year, he was severely wounded by an explosion. He was evacuated to England, where he died on January 2, 1918 at age 31. His body is buried in the churchyard of All Saints Church, Little Shelford, Cambridgeshire, United Kingdom.

53rd Battery, Canadian Field Artillery Died 2 January 1918, at 31 years of age.

H.P. Rossiter was an original Master at Appleby School from 1911 to 1915.