Born in Szeged, Hungary (then the Austro-Hungarian Empire) on October 19, 1920, Glassen emigrated with his parents to Toronto, Canada in 1929, residing on Gladstone Avenue in the city's west end. He graduated from Bloor Collegiate Institute in 1940.
Born in Szeged, Hungary (then part of the Austro-Hungarian Empire) on October 19, 1920, Glassen emigrated with his parents to Toronto, Canada in 1929 and resided at Gladstone Avenue in the city's west end. He graduated from Bloor Collegiate Institute in 1940.