Singleton Wyndham Muncey was born 6 November 1879 in Carleton, Prince Edward Island to telegraph operator Townsend Coffin Muncey and Harriet Muttart. He spent some time in Winnipeg before enlisting as a Sergeant with the E. Battery, Royal Field Artillery on 19 January 1900 to fight in the South African Boer War. At the end of formal fighting, Singleton joined Howard's Scouts and continued to fight the Boer soldiers. On 4 February 1901 he was wounded in the left shoulder. The injury resulted in the paralysis of his arm and Singleton spent the following year in England where he partially overcame his disability. Following his release, Singleton returned to P.E.I. where he married Elma Lovnetta Schurman in 1904.

Singleton also served in the First World War as a lieutenant in the 188th Battalion, serving in France with the 5th Battalion and was part of the Army of Occupation in Germany. Following the General Demobilization in 1919 Singleton resided in Vancouver, where he remained until his death in 1945.

Singleton and Harriet had one daughter, Doris, who later married Reginald T. Haslam. Doris is the author of "The Wrights of Bedeque, Prince Edward Island: A Loyalist Family" (1978) and co-author of "An Island Refuge: Loyalists and Disbanded Troops on the Island of St. John" (1983). Singleton also had a son named Wyndham with his second wife, Alma Marion Aylward. Singleton died 23 October 1945 in Vancouver, British Columbia.