Born in Sudbury, Ontario Muncaster began working at his father's Canadian Tire Associate Store at the age of 12 sweeping floors and stocking shelves.
After shareholder in-fighting was resolved Muncaster, then aged 33, returned to corporate Canadian Tire as president in 1966.
Muncaster made significant changes to Canadian Tire's management personnel that saw many of his Northwestern University MBA classmates in key positions.
[2] During the 1970s as a result of his work at Canadian Tire Muncaster sat on numerous boards including CP Hotels, Black & Decker, Sara Lee, Ontario Hydro, and Bell Canada.
Muncaster died in Puerto Vallarta, Mexico on March 13, 2012, at the 78 years of age.